warmux: fix build

pkgs/games/warmux/default.nix

@@ -30,10 +30,12 @@ rec {
   inherit buildInputs;
 
   /* doConfigure should be removed if not needed */
-  phaseNames = ["doConfigure" "doMakeInstall"];
+  phaseNames = ["doPatch" "doConfigure" "doMakeInstall"];
 
   configureFlags = "CFLAGS=\"-include ${zlib}/include/zlib.h\"";
 
+  patches = [ ./gcc-fix.patch ];
+
   meta = {
     description = "Ballistics turn-based battle game between teams";
     maintainers = with a.lib.maintainers;