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/scummvm/default.nix

@@ -10,6 +10,18 @@ stdenv.mkDerivation {
   
   buildInputs = [SDL zlib mpeg2dec];
 
+  crossAttrs = {
+    preConfigure = ''
+      # Remove the --build flag set by the gcc cross wrapper setup
+      # hook
+      export configureFlags="--host=${stdenv.cross.config}"
+    '';
+    postConfigure = ''
+      # They use 'install -s', that calls the native strip instead of the cross
+      sed -i 's/-c -s/-c/' ports.mk;
+    '';
+  };
+
   meta = {
     description = "Program to run certain classic graphical point-and-click adventure games (such as Monkey Island)";
     homepage = http://www.scummvm.org/;