Avoid using the incomplete type "struct siginfo"; use siginfo_t instead.

Basically this is a replacement 's/struct siginfo/siginfo_t/g' on the whole
gcc source tree. It avoids error messages like this one:
gcc-3.4.6/gcc/unwind-dw2.c: In function `uw_frame_state_for':
gcc-3.4.6/gcc/unwind-dw2.c:1031: error: field `info' has incomplete type

Based on the essence of https://bugs.gentoo.org/show_bug.cgi?id=424970#c3

2012-12-29 Martin von Gagern

Index: gcc-3.4.6/gcc/config/alpha/linux.h
===================================================================
--- gcc-3.4.6.orig/gcc/config/alpha/linux.h
+++ gcc-3.4.6/gcc/config/alpha/linux.h
@@ -95,7 +95,7 @@ Boston, MA 02111-1307, USA.  */
     else if (pc_[1] == 0x201f015f)	/* lda $0,NR_rt_sigreturn */	\
       {									\
 	struct rt_sigframe {						\
-	  struct siginfo info;						\
+	  siginfo_t info;						\
 	  struct ucontext uc;						\
 	} *rt_ = (CONTEXT)->cfa;					\
 	sc_ = &rt_->uc.uc_mcontext;					\
Index: gcc-3.4.6/gcc/config/i386/linux.h
===================================================================
--- gcc-3.4.6.orig/gcc/config/i386/linux.h
+++ gcc-3.4.6/gcc/config/i386/linux.h
@@ -235,9 +235,9 @@ Boston, MA 02111-1307, USA.  */
       {									\
 	struct rt_sigframe {						\
 	  int sig;							\
-	  struct siginfo *pinfo;					\
+	  siginfo_t *pinfo;					\
 	  void *puc;							\
-	  struct siginfo info;						\
+	  siginfo_t info;						\
 	  struct ucontext uc;						\
 	} *rt_ = (CONTEXT)->cfa;					\
 	sc_ = (struct sigcontext *) &rt_->uc.uc_mcontext;		\
Index: gcc-3.4.6/gcc/config/i386/linux64.h
===================================================================
--- gcc-3.4.6.orig/gcc/config/i386/linux64.h
+++ gcc-3.4.6/gcc/config/i386/linux64.h
@@ -164,9 +164,9 @@ Boston, MA 02111-1307, USA.  */
       {									\
 	struct rt_sigframe {						\
 	  int sig;							\
-	  struct siginfo *pinfo;					\
+	  siginfo_t *pinfo;					\
 	  void *puc;							\
-	  struct siginfo info;						\
+	  siginfo_t info;						\
 	  struct ucontext uc;						\
 	} *rt_ = (CONTEXT)->cfa;					\
 	sc_ = (struct sigcontext *) &rt_->uc.uc_mcontext;		\
Index: gcc-3.4.6/gcc/config/ia64/linux.h
===================================================================
--- gcc-3.4.6.orig/gcc/config/ia64/linux.h
+++ gcc-3.4.6/gcc/config/ia64/linux.h
@@ -86,7 +86,7 @@ do {						\
       struct sigframe {							\
 	char scratch[16];						\
 	unsigned long sig_number;					\
-	struct siginfo *info;						\
+	siginfo_t *info;						\
 	struct sigcontext *sc;						\
       } *frame_ = (struct sigframe *)(CONTEXT)->psp;			\
       struct sigcontext *sc_ = frame_->sc;				\
@@ -159,7 +159,7 @@ do {						\
       struct sigframe {							\
 	char scratch[16];						\
 	unsigned long sig_number;					\
-	struct siginfo *info;						\
+	siginfo_t *info;						\
 	struct sigcontext *sc;						\
       } *frame_ = (struct sigframe *)(CONTEXT)->psp;			\
       struct sigcontext *sc_ = frame_->sc;				\
Index: gcc-3.4.6/gcc/config/mips/linux.h
===================================================================
--- gcc-3.4.6.orig/gcc/config/mips/linux.h
+++ gcc-3.4.6/gcc/config/mips/linux.h
@@ -233,7 +233,7 @@ typedef struct _sig_ucontext {
       {                                                              \
         struct rt_sigframe {                                         \
           u_int32_t  trampoline[2];                                \
-          struct siginfo info;                                       \
+          siginfo_t info;                                       \
           _sig_ucontext_t uc;                                        \
         } *rt_ = (CONTEXT)->ra;                                      \
         sc_ = &rt_->uc.uc_mcontext;                                  \
Index: gcc-3.4.6/gcc/config/sh/linux.h
===================================================================
--- gcc-3.4.6.orig/gcc/config/sh/linux.h
+++ gcc-3.4.6/gcc/config/sh/linux.h
@@ -250,7 +250,7 @@ do { \
 		 && (*(unsigned short *) (pc_+14)  == 0x00ad))))	\
       {									\
 	struct rt_sigframe {						\
-	  struct siginfo info;						\
+	  siginfo_t info;						\
 	  struct ucontext uc;						\
 	} *rt_ = (CONTEXT)->cfa;					\
 	sc_ = (struct sigcontext *) &rt_->uc.uc_mcontext;		\