gcc.fix_build-with-cxx

On native builds, when linking cc1 with static libraries (ppl cloog,
gmp, mpfr), there is c++ code brought in by libppl. Normally cc1 is
linked through "gcc", but in this case it should be linked with "g++".

To work around this, gcc is configured with --enable-build-with-cxx,
which compiles and links the entire compiler with g++. Since g++ is
more rigorous about the use of the "const" keyword, there is a couple
of places that we get syntax errors. This patch fixes them.

--- gcc-4.6.0/gcc/config/rs6000/rs6000.c-orig	2011-05-09 10:35:55.627190744 -0500
+++ gcc-4.6.0/gcc/config/rs6000/rs6000.c	2011-05-09 10:39:09.232814653 -0500
@@ -22502,11 +22502,12 @@
 rs6000_xcoff_strip_dollar (const char *name)
 {
   char *strip, *p;
+  const char *q;
   int len;
 
-  p = strchr (name, '$');
+  q = strchr (name, '$');
 
-  if (p == 0 || p == name)
+  if (q == 0 || q == name)
     return name;
 
   len = strlen (name);
--- gcc-4.6.0/gcc/objc/objc-next-runtime-abi-02.c-orig	2011-05-11 13:46:44.559065173 -0500
+++ gcc-4.6.0/gcc/objc/objc-next-runtime-abi-02.c	2011-05-11 13:48:34.956939829 -0500
@@ -1878,7 +1878,7 @@
 static const char *
 newabi_append_ro (const char *name)
 {
-  char *dollar;
+  const char *dollar;
   char *p;
   static char string[BUFSIZE];
   dollar = strchr (name, '$');