Fixing as-needed issues

http://bugs.gentoo.org/313165

--- configure.ac
+++ configure.ac
@@ -39,8 +39,8 @@
 AC_PROG_MAKE_SET
 LT_CONFIG_LTDL_DIR([libltdl])
 LT_INIT([disable-static dlopen win32-dll])
-AM_PATH_LIBLTDL([lt_dlopenext lt_dlsym], ,AC_MSG_ERROR([GNUnet needs libltdl]))
 LT_LIB_DLLOAD
+AM_PATH_LIBLTDL([lt_dlopenext lt_dlsym], ,AC_MSG_ERROR([GNUnet needs libltdl]))
 AC_SUBST(MKDIR_P)
 
 # large file support
--- m4/libltdl-external.m4
+++ m4/libltdl-external.m4
@@ -19,15 +19,17 @@
      libltdl_prefix="$withval", libltdl_prefix="")
   ltdl_save_CPPFLAGS="$CPPFLAGS"
   ltdl_save_LDFLAGS="$LDFLAGS"
+  ltdl_save_LIBS="$LIBS"
   if test x$libltdl_prefix != x ; then
-    CPPFLAGS="-I$libltdl_prefix/include $CPPFLAGS"
-    LDFLAGS="-L$libltdl_prefix/lib -lltdl $LDFLAGS"
+    CPPFLAGS="$CPPFLAGS -I$libltdl_prefix/include"
+    LDFLAGS="$LDFLAGS -L$libltdl_prefix/lib"
+    LIBS="-lltdl $LIBS"
   else
     if test x"$LIBLTDL" = x ; then
       LIBLTDL="-lltdl"
     fi
     CPPFLAGS="$LTDLINCL $CPPFLAGS"
-    LDFLAGS="$LIBLTDL $LDFLAGS"
+    LIBS="$LIBLTDL $LIBS"
   fi
 
   symbols_to_check=ifelse([$1], ,"ltdl_dlopen","$1")
@@ -59,6 +61,7 @@
   fi
   CPPFLAGS="$ltdl_save_CPPFLAGS"
   LDFLAGS="$ltdl_save_LDFLAGS"
+  LIBS="$ltdl_save_LIBS"
 
   AC_MSG_CHECKING(for libltdl with symbols $symbols_to_check)
   if test $ltdl_found = yes; then