Disable DRI on xorg for the fuloong2f, as mesa does not include 'dri.pc' in that platform,

and the autodetection of DRI by the xorgserver configure script looks like it needs
an explicit "--disable-dri" to go on.

svn path=/nixpkgs/branches/stdenv-updates/; revision=23045

pkgs/servers/x11/xorg/overrides.nix

@@ -149,6 +149,8 @@ in
         rm -fr $out/share/X11/xkb/compiled
         ln -s /var/tmp $out/share/X11/xkb/compiled
       '';
+    configureFlagsArray = args.stdenv.lib.optionals
+      (args.stdenv.system == "ict_loongson-2_v0.3_fpu_v0.1-linux") [ "--disable-dri" ];
   };
 
   libSM = attrs: attrs // args.stdenv.lib.optionalAttrs (args.stdenv.system == "i686-darwin") {