Bug 683975 - Need infra for developer contributed compilers. r=rail.

Downgrade glibc to 2.10.1.

build/unix/build-toolchain/build-gcc.py

@@ -154,7 +154,7 @@ def build_source_dir(prefix, version):
     return source_dir + '/' + prefix + version
 
 binutils_version = "2.21.1"
-glibc_version = "2.11.1" #FIXME: should probably use 2.5.1
+glibc_version = "2.10.1" #FIXME: should probably use 2.5.1
 tar_version = "1.26"
 make_version = "3.81"
 gcc_version = "4.5.2"

build/unix/build-toolchain/glibc-deterministic.patch

@@ -1,7 +1,22 @@
 diff -ru a/configure.in b/configure.in
 --- a/configure.in	2011-01-17 23:34:07.000000000 -0500
 +++ b/configure.in	2012-01-25 20:40:27.919485606 -0500
-@@ -2230,6 +2230,7 @@
+@@ -894,14 +894,6 @@
+ LIBC_PROG_BINUTILS
+ AC_SUBST(MIG)dnl Needed by sysdeps/mach/configure.in
+ 
+-# Accept binutils 2.13 or newer.
+-AC_CHECK_PROG_VER(AS, $AS, --version,
+-		  [GNU assembler.* \([0-9]*\.[0-9.]*\)],
+-		  [2.1[3-9]*], AS=: critic_missing="$critic_missing as")
+-AC_CHECK_PROG_VER(LD, $LD, --version,
+-		  [GNU ld.* \([0-9][0-9]*\.[0-9.]*\)],
+-		  [2.1[3-9]*], LD=: critic_missing="$critic_missing ld")
+-
+ # We need the physical current working directory.  We cannot use the
+ # "pwd -P" shell builtin since that's not portable.  Instead we try to
+ # find a pwd binary.  Note that assigning to the PWD environment
+@@ -2251,6 +2243,7 @@
  fi
  AC_SUBST(old_glibc_headers)
  
@@ -12,7 +27,7 @@ diff -ru a/configure.in b/configure.in
 diff -ru a/csu/Makefile b/csu/Makefile
 --- a/csu/Makefile	2011-01-17 23:34:07.000000000 -0500
 +++ b/csu/Makefile	2012-01-23 13:58:28.957792633 -0500
-@@ -234,8 +234,7 @@
+@@ -223,8 +223,7 @@
  		   if [ -z "$$os" ]; then \
  		     os=Linux; \
  		   fi; \
@@ -25,7 +40,7 @@ diff -ru a/csu/Makefile b/csu/Makefile
 diff -ru a/Makerules b/Makerules
 --- a/Makerules	2011-01-17 23:34:07.000000000 -0500
 +++ b/Makerules	2012-01-30 08:47:56.565068903 -0500
-@@ -992,9 +992,9 @@
+@@ -977,9 +977,9 @@
  	 echo '   Use the shared library, but some functions are only in';\
  	 echo '   the static library, so try that secondarily.  */';\
  	 cat $<; \