Fix build on case-insensitive FS as per 
https://bugs.chromium.org/p/nativeclient/issues/detail?id=855 and
https://codereview.chromium.org/3299002/.

--- glibc-2.23/extra-lib.mk.orig	2016-02-18 18:54:00.000000000 +0100
+++ glibc-2.23/extra-lib.mk	2016-04-06 18:30:22.000000000 +0200
@@ -13,7 +13,7 @@
 
 ifneq (,$($(lib)-static-only-routines))
 ifneq (,$(filter yes%,$(build-shared)$($(lib).so-version)))
-object-suffixes-$(lib) += $(filter-out $($(lib)-inhibit-o),.oS)
+object-suffixes-$(lib) += $(filter-out $($(lib)-inhibit-o),.ons)
 endif
 endif
 
@@ -29,7 +29,7 @@
 
 # Add each flavor of library to the lists of things to build and install.
 install-lib += $(foreach o,$(object-suffixes-$(lib)),$(lib:lib%=$(libtype$o)))
-extra-objs += $(foreach o,$(filter-out .os .oS,$(object-suffixes-$(lib))),\
+extra-objs += $(foreach o,$(filter-out .os .ons,$(object-suffixes-$(lib))),\
 			$(patsubst %,%$o,$(filter-out \
 					   $($(lib)-shared-only-routines),\
 					   $(all-$(lib)-routines))))
@@ -37,8 +37,8 @@
 extra-objs += $(patsubst %,%.os,$(filter-out $($(lib)-static-only-routines),\
 					     $(all-$(lib)-routines)))
 endif
-ifneq (,$(filter .oS,$(object-suffixes-$(lib))))
-extra-objs += $(patsubst %,%.oS,$(filter $($(lib)-static-only-routines),\
+ifneq (,$(filter .ons,$(object-suffixes-$(lib))))
+extra-objs += $(patsubst %,%.ons,$(filter $($(lib)-static-only-routines),\
 					 $(all-$(lib)-routines)))
 endif
 alltypes-$(lib) := $(foreach o,$(object-suffixes-$(lib)),\
@@ -62,7 +62,7 @@
 
 
 # Use o-iterator.mk to generate a rule for each flavor of library.
-ifneq (,$(filter-out .os .oS,$(object-suffixes-$(lib))))
+ifneq (,$(filter-out .os .ons,$(object-suffixes-$(lib))))
 define o-iterator-doit
 $(objpfx)$(patsubst %,$(libtype$o),$(lib:lib%=%)): \
   $(patsubst %,$(objpfx)%$o,\
@@ -70,7 +70,7 @@
 			  $(all-$(lib)-routines))); \
 	$$(build-extra-lib)
 endef
-object-suffixes-left = $(filter-out .os .oS,$(object-suffixes-$(lib)))
+object-suffixes-left = $(filter-out .os .ons,$(object-suffixes-$(lib)))
 include $(patsubst %,$(..)o-iterator.mk,$(object-suffixes-left))
 endif
 
@@ -82,9 +82,9 @@
 	$(build-extra-lib)
 endif
 
-ifneq (,$(filter .oS,$(object-suffixes-$(lib))))
-$(objpfx)$(patsubst %,$(libtype.oS),$(lib:lib%=%)): \
-  $(patsubst %,$(objpfx)%.oS,\
+ifneq (,$(filter .ons,$(object-suffixes-$(lib))))
+$(objpfx)$(patsubst %,$(libtype.ons),$(lib:lib%=%)): \
+  $(patsubst %,$(objpfx)%.ons,\
 	     $(filter $($(lib)-static-only-routines),\
 		      $(all-$(lib)-routines)))
 	$(build-extra-lib)
--- glibc-2.23/Makeconfig.orig	2016-02-18 18:54:00.000000000 +0100
+++ glibc-2.23/Makeconfig	2016-04-06 18:30:22.000000000 +0200
@@ -496,7 +496,7 @@
 link-libc-tests-rpath-link = $(link-libc-rpath-link)
 endif
 link-libc-before-gnulib = $(common-objpfx)libc.so$(libc.so-version) \
-			  $(common-objpfx)$(patsubst %,$(libtype.oS),c) \
+			  $(common-objpfx)$(patsubst %,$(libtype.ons),c) \
 			  $(as-needed) $(elf-objpfx)ld.so \
 			  $(no-as-needed)
 link-libc = $(link-libc-rpath-link) $(link-libc-before-gnulib) $(gnulib)
@@ -904,7 +904,7 @@
 # The compilation rules use $(CPPFLAGS-${SUFFIX}) and $(CFLAGS-${SUFFIX})
 # to pass different flags for each flavor.
 libtypes = $(foreach o,$(object-suffixes-for-libc),$(libtype$o))
-all-object-suffixes := .o .os .op .og .oS
+all-object-suffixes := .o .os .op .og .ons
 object-suffixes :=
 CPPFLAGS-.o = $(pic-default)
 CFLAGS-.o = $(filter %frame-pointer,$(+cflags))
@@ -943,14 +943,14 @@
 
 ifeq (yes,$(build-shared))
 # Build special library that contains the static-only routines for libc.
-object-suffixes-for-libc += .oS
+object-suffixes-for-libc += .ons
 
 # Must build the routines as PIC, though, because they can end up in (users')
 # shared objects.  We don't want to use CFLAGS-os because users may, for
 # example, make that processor-specific.
-CFLAGS-.oS = $(CFLAGS-.o) $(PIC-ccflag)
-CPPFLAGS-.oS = $(CPPFLAGS-.o) -DPIC -DLIBC_NONSHARED=1
-libtype.oS = lib%_nonshared.a
+CFLAGS-.ons = $(CFLAGS-.o) $(PIC-ccflag)
+CPPFLAGS-.ons = $(CPPFLAGS-.o) -DPIC -DLIBC_NONSHARED=1
+libtype.ons = lib%_nonshared.a
 endif
 
 # The assembler can generate debug information too.
--- glibc-2.23/Makerules.orig	2016-02-18 18:54:00.000000000 +0100
+++ glibc-2.23/Makerules	2016-04-06 18:30:22.000000000 +0200
@@ -465,7 +465,7 @@
 endif
 endif
 
-elide-routines.oS += $(filter-out $(static-only-routines),\
+elide-routines.ons += $(filter-out $(static-only-routines),\
 				  $(routines) $(aux) $(sysdep_routines))
 elide-routines.os += $(static-only-routines)
 
@@ -744,7 +744,7 @@
 
 +depfiles := $(sources:.c=.d) \
 	     $(patsubst %.o,%.d,$(filter %.o,$(extra-objs:.os=.o))) \
-	     $(patsubst %.oS,%.d,$(filter %.oS,$(extra-objs))) \
+	     $(patsubst %.ons,%.d,$(filter %.ons,$(extra-objs))) \
 	     $(patsubst %.o,%.d,$(filter %.o,$(extra-test-objs:.os=.o))) \
 	     $(addsuffix .d,$(tests) $(xtests) $(test-srcs))
 ifeq ($(build-programs),yes)
@@ -1055,7 +1055,7 @@
 install: $(inst_libdir)/libc.so
 $(inst_libdir)/libc.so: $(common-objpfx)format.lds \
 			$(common-objpfx)libc.so$(libc.so-version) \
-			$(inst_libdir)/$(patsubst %,$(libtype.oS),\
+			$(inst_libdir)/$(patsubst %,$(libtype.ons),\
 						  $(libprefix)$(libc-name)) \
 			$(+force)
 	(echo '/* GNU ld script';\
@@ -1063,7 +1063,7 @@
 	 echo '   the static library, so try that secondarily.  */';\
 	 cat $<; \
 	 echo 'GROUP ( $(slibdir)/libc.so$(libc.so-version)' \
-	      '$(libdir)/$(patsubst %,$(libtype.oS),$(libprefix)$(libc-name))'\
+	      '$(libdir)/$(patsubst %,$(libtype.ons),$(libprefix)$(libc-name))'\
 	      ' AS_NEEDED (' $(rtlddir)/$(rtld-installed-name) ') )' \
 	) > $@.new
 	mv -f $@.new $@
--- glibc-2.23/nptl/Makefile.orig	2016-02-18 18:54:00.000000000 +0100
+++ glibc-2.23/nptl/Makefile	2016-04-06 18:30:22.000000000 +0200
@@ -428,7 +428,7 @@
 
 $(inst_libdir)/libpthread.so: $(common-objpfx)format.lds \
 			      $(objpfx)libpthread.so$(libpthread.so-version) \
-			      $(inst_libdir)/$(patsubst %,$(libtype.oS),\
+			      $(inst_libdir)/$(patsubst %,$(libtype.ons),\
 							$(libprefix)pthread) \
 			      $(+force)
 	(echo '/* GNU ld script';\
@@ -436,7 +436,7 @@
 	 echo '   the static library, so try that secondarily.  */';\
 	 cat $<; \
 	 echo 'GROUP ( $(slibdir)/libpthread.so$(libpthread.so-version)' \
-	      '$(libdir)/$(patsubst %,$(libtype.oS),$(libprefix)pthread)'\
+	      '$(libdir)/$(patsubst %,$(libtype.ons),$(libprefix)pthread)'\
 	      ')' \
 	) > $@.new
 	mv -f $@.new $@
--- glibc-2.23/sysdeps/i386/i686/Makefile.orig	2016-02-18 18:54:00.000000000 +0100
+++ glibc-2.23/sysdeps/i386/i686/Makefile	2016-04-06 18:30:22.000000000 +0200
@@ -5,10 +5,10 @@
 CFLAGS-.os += -Wa,-mtune=i686
 CFLAGS-.op += -Wa,-mtune=i686
 CFLAGS-.og += -Wa,-mtune=i686
-CFLAGS-.oS += -Wa,-mtune=i686
+CFLAGS-.ons += -Wa,-mtune=i686
 
 ASFLAGS-.o += -Wa,-mtune=i686
 ASFLAGS-.os += -Wa,-mtune=i686
 ASFLAGS-.op += -Wa,-mtune=i686
 ASFLAGS-.og += -Wa,-mtune=i686
-ASFLAGS-.oS += -Wa,-mtune=i686
+ASFLAGS-.ons += -Wa,-mtune=i686
--- glibc-2.23/sysdeps/ieee754/ldbl-opt/Makefile.orig	2016-02-18 18:54:00.000000000 +0100
+++ glibc-2.23/sysdeps/ieee754/ldbl-opt/Makefile	2016-04-06 18:30:22.000000000 +0200
@@ -44,7 +44,7 @@
 libnldbl-routines = $(libnldbl-calls:%=nldbl-%)
 libnldbl-inhibit-o = $(object-suffixes)
 libnldbl-static-only-routines = $(libnldbl-routines)
-extra-objs += $(addsuffix .oS, $(libnldbl-routines))
+extra-objs += $(addsuffix .ons, $(libnldbl-routines))
 
 CFLAGS-nldbl-acos.c = -fno-builtin-acosl
 CFLAGS-nldbl-acosh.c = -fno-builtin-acoshl
--- glibc-2.23/sysdeps/sparc/sparc32/sparcv9/Makefile.orig	2016-02-18 18:54:00.000000000 +0100
+++ glibc-2.23/sysdeps/sparc/sparc32/sparcv9/Makefile	2016-04-06 18:30:22.000000000 +0200
@@ -5,13 +5,13 @@
 ASFLAGS-.os += -Wa,-Av9d
 ASFLAGS-.op += -Wa,-Av9d
 ASFLAGS-.og += -Wa,-Av9d
-ASFLAGS-.oS += -Wa,-Av9d
+ASFLAGS-.ons += -Wa,-Av9d
 else
 ASFLAGS-.o += -Wa,-Av9a
 ASFLAGS-.os += -Wa,-Av9a
 ASFLAGS-.op += -Wa,-Av9a
 ASFLAGS-.og += -Wa,-Av9a
-ASFLAGS-.oS += -Wa,-Av9a
+ASFLAGS-.ons += -Wa,-Av9a
 endif
 
 # nscd uses atomic_spin_nop which in turn requires cpu_relax
--- glibc-2.23/sysdeps/sparc/sparc64/Makefile.orig	2016-02-18 18:54:00.000000000 +0100
+++ glibc-2.23/sysdeps/sparc/sparc64/Makefile	2016-04-06 18:30:22.000000000 +0200
@@ -7,7 +7,7 @@
 ASFLAGS-.os += -Wa,-Av9d
 ASFLAGS-.op += -Wa,-Av9d
 ASFLAGS-.og += -Wa,-Av9d
-ASFLAGS-.oS += -Wa,-Av9d
+ASFLAGS-.ons += -Wa,-Av9d
 endif
 
 # nscd uses atomic_spin_nop which in turn requires cpu_relax