gcc: Revive the no-sys-dirs patch

For now, we don't NATIVE_SYSTEM_HEADER_DIR because it breaks the
build. However, it points to Glibc in the Nix store (not /usr/include)
so it's kind of okay.

pkgs/development/compilers/gcc/4.8/default.nix

@@ -64,6 +64,7 @@ let version = "4.8.3";
     patches = []
       ++ optional enableParallelBuilding ./parallel-bconfig.patch
       ++ optional (cross != null) ./libstdc++-target.patch
+      ++ optional noSysDirs ./no-sys-dirs.patch
       # The GNAT Makefiles did not pay attention to CFLAGS_FOR_TARGET for its
       # target libraries and tools.
       ++ optional langAda ./gnat-cflags.patch

pkgs/development/compilers/gcc/4.8/no-sys-dirs.patch

@@ -0,0 +1,28 @@
+diff -ru -x '*~' gcc-4.8.3-orig/gcc/cppdefault.c gcc-4.8.3/gcc/cppdefault.c
+--- gcc-4.8.3-orig/gcc/cppdefault.c	2013-01-10 21:38:27.000000000 +0100
++++ gcc-4.8.3/gcc/cppdefault.c	2014-08-18 16:20:32.893944536 +0200
+@@ -35,6 +35,8 @@
+ # undef CROSS_INCLUDE_DIR
+ #endif
+ 
++#undef LOCAL_INCLUDE_DIR
++
+ const struct default_include cpp_include_defaults[]
+ #ifdef INCLUDE_DEFAULTS
+ = INCLUDE_DEFAULTS;
+diff -ru -x '*~' gcc-4.8.3-orig/gcc/gcc.c gcc-4.8.3/gcc/gcc.c
+--- gcc-4.8.3-orig/gcc/gcc.c	2014-03-23 12:30:57.000000000 +0100
++++ gcc-4.8.3/gcc/gcc.c	2014-08-18 13:19:32.689201690 +0200
+@@ -1162,10 +1162,10 @@
+ /* Default prefixes to attach to command names.  */
+ 
+ #ifndef STANDARD_STARTFILE_PREFIX_1
+-#define STANDARD_STARTFILE_PREFIX_1 "/lib/"
++#define STANDARD_STARTFILE_PREFIX_1 ""
+ #endif
+ #ifndef STANDARD_STARTFILE_PREFIX_2
+-#define STANDARD_STARTFILE_PREFIX_2 "/usr/lib/"
++#define STANDARD_STARTFILE_PREFIX_2 ""
+ #endif
+ 
+ #ifdef CROSS_DIRECTORY_STRUCTURE  /* Don't use these prefixes for a cross compiler.  */