Fix fallout of recent cc-wrapper changes

Fixes tarball except for 56e21d05e8

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

@@ -29,7 +29,7 @@ stdenv.mkDerivation {
       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

@@ -35,6 +35,9 @@ stdenv.mkDerivation {
   '';
 
   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;