Fix fallout of recent cc-wrapper changes

Fixes tarball except for 56e21d05e874a29ad0d51aea18e8c982c7c826f3

pkgs/development/compilers/gcc/3.4/default.nix

···
     }
   ";
 
-  passthru = { inherit langC langCC langF77; };
+  passthru = { inherit langC langCC langF77; isGNU = true; };
 
   meta = {
     homepage = "http://gcc.gnu.org/";

pkgs/development/compilers/gcc/4.3/default.nix

···
     rm -Rf ghdl-*
   '';
 
+  passthru.isGNU = true;
+
   meta = {
     homepage = "http://ghdl.free.fr/";
     license = stdenv.lib.licenses.gpl2Plus;

pkgs/development/compilers/gcc/4.4/default.nix

···
 
 
   passthru = { inherit langC langCC langAda langFortran langVhdl
-      enableMultilib version; };
+      enableMultilib version; isGNU = true; };
 
   # ghdl does not build fine with parallel building
   # http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46173

pkgs/development/compilers/gcc/4.5/default.nix

···
     else null;
 
   passthru = { inherit langC langCC langAda langFortran langVhdl
-      enableMultilib version; };
+      enableMultilib version; isGNU = true; };
 
   enableParallelBuilding = !langAda;
 

pkgs/development/compilers/gcc/4.6/default.nix

···
     else null;
 
   passthru = { inherit langC langCC langAda langFortran langVhdl
-      langGo version; };
+      langGo version; isGNU = true; };
 
   enableParallelBuilding = false;
 

pkgs/development/compilers/llvm/3.3/clang.nix

···
       sha256 = "15mrvw43s4frk1j49qr4v5viq68h8qlf10qs6ghd6mrsmgj5vddi";
   };
 
-  passthru = { cc = stdenv.cc.cc; };
+  passthru = { cc = stdenv.cc.cc; gcc = gccReal; };
 
   meta = {
     homepage = http://clang.llvm.org/;

pkgs/development/compilers/llvm/3.4/clang.nix

···
   '';
 
   passthru.cc = stdenv.cc.cc;
+  # GCC_INSTALL_PREFIX points here, so just use it even though it may not
+  # actually be a gcc
+  passthru.gcc = stdenv.cc.cc;
 
   enableParallelBuilding = true;
 

pkgs/development/tools/misc/distcc/default.nix

···
       #
       # extraConfig is meant to be sh lines exporting environment
       # variables like DISTCC_HOSTS, DISTCC_DIR, ...
-      links = extraConfig : (runCommand "distcc-links" { }
+      links = extraConfig: (runCommand "distcc-links" { passthru.gcc = gcc.cc; }
         ''
           mkdir -p $out/bin
           if [ -x "${gcc.cc}/bin/gcc" ]; then