mar1d: add patch for Darwin

pkgs/games/mar1d/default.nix

@@ -8,6 +8,7 @@
 , ninja
 , pkg-config
 , fetchFromGitHub
+, fetchpatch
 }:
 
 stdenv.mkDerivation rec {
@@ -30,6 +31,15 @@ stdenv.mkDerivation rec {
     libGLU
   ];
 
+  patches = [
+    # Fix the build on Darwin.
+    # https://github.com/Radvendii/MAR1D/pull/4
+    (fetchpatch {
+      url = "https://github.com/Radvendii/MAR1D/commit/baf3269e90eca69f154a43c4c1ef14677a6300fd.patch";
+      hash = "sha256-ybdLA2sO8e0J7w4roSdMWn72OkttD3y+cJ3ScuGiHCI=";
+    })
+  ];
+
   meta = with lib; {
     description = "First person Super Mario Bros";
     mainProgram = "MAR1D";