* gcc-wrapper: use the right dynamic linker when -m32 is used.

* An attribute `stdenv_32bit' that returns a stdenv capable of
  building 32-bit binaries.
* grub: build on x86_64-linux.

svn path=/nixpkgs/trunk/; revision=12211

pkgs/tools/misc/grub/default.nix

@@ -1,9 +1,5 @@
 {stdenv, fetchurl, autoconf, automake}:
 
-if stdenv.system == "x86_64-linux" then
-  abort "Grub doesn't build on x86_64-linux.  You should use the build for i686-linux instead."
-else
-
 stdenv.mkDerivation {
   name = "grub-0.97-patch-1.7";