Fixing the gcc-cross-wrapper; it failed after some changes related to breaking

dependencies with it. (I should never link ld.so with a NIX_LDFLAGS -rpath
forced)

I made vim, scummvm cross-build. I added prboom (that cross-builds).
Mplayer and elinks don't cross-build fine still, but are on the way.
The mplayer fails to build in a weird way; nix does not show either a gcc
error message or even the 'make' error message.

svn path=/nixpkgs/branches/stdenv-updates/; revision=23131

pkgs/games/prboom/default.nix

@@ -0,0 +1,20 @@
+{stdenv, fetchurl, SDL, SDL_mixer, SDL_net, mesa}:
+
+stdenv.mkDerivation {
+  name = "prboom-2.5.0";
+  src = fetchurl {
+    url = mirror://sourceforge/prboom/prboom-2.5.0.tar.gz;
+    sha256 = "1bjb04q8dk232956k30qlpq6q0hxb904yh1nflr87jcc1x3iqv12";
+  };
+
+  buildInputs = [ SDL SDL_mixer SDL_net mesa ];
+  crossAttrs = {
+    propagatedBuildInputs = [ SDL.hostDrv SDL_mixer.hostDrv SDL_net.hostDrv ];
+    configureFlags = "--disable-gl --disable-cpu-opt --without-x --disable-sdltest
+      ac_cv_type_uid_t=yes ac_cv_type_gid_t=yes";
+
+    postInstall = ''
+      mv $out/games/ $out/bin
+    '';
+  };
+}