uboot: (firmwareOdroidC2/C4) don't invoke patch tool, use patches = [] instead

https://github.com/NixOS/nixpkgs/blob/master/pkgs/stdenv/generic/setup.sh#L948
this can do it nicely.

Signed-off-by: Anton Arapov <anton@deadbeef.mx>

pkgs/games/openra/engines.nix

@@ -0,0 +1,41 @@
+{ buildOpenRAEngine, fetchFromGitHub, postFetch }:
+
+let
+  buildUpstreamOpenRAEngine = { version, rev, sha256 }: name: (buildOpenRAEngine {
+    inherit version;
+    description = "Open-source re-implementation of Westwood Studios' 2D Command and Conquer games";
+    homepage = "https://www.openra.net/";
+    mods = [ "cnc" "d2k" "ra" "ts" ];
+    src = fetchFromGitHub {
+      owner = "OpenRA";
+      repo = "OpenRA" ;
+      inherit rev sha256 postFetch;
+    };
+  } name).overrideAttrs (origAttrs: {
+    postInstall = ''
+      ${origAttrs.postInstall}
+      cp -r mods/ts $out/lib/openra/mods/
+      cp mods/ts/icon.png $(mkdirp $out/share/pixmaps)/openra-ts.png
+      ( cd $out/share/applications; sed -e 's/Dawn/Sun/g' -e 's/cnc/ts/g' openra-cnc.desktop > openra-ts.desktop )
+    '';
+  });
+
+in {
+  release = name: (buildUpstreamOpenRAEngine rec {
+    version = "20190314";
+    rev = "${name}-${version}";
+    sha256 = "15pvn5cx3g0nzbrgpsfz8dngad5wkzp5dz25ydzn8bmxafiijvcr";
+  } name);
+
+  playtest = name: (buildUpstreamOpenRAEngine rec {
+    version = "20190302";
+    rev = "${name}-${version}";
+    sha256 = "1vqvfk2p2lpk3m0d3rpvj34i8cmk3mfc7w4cn4llqd9zp4kk9pya";
+  } name);
+
+  bleed = buildUpstreamOpenRAEngine {
+    version = "8ee1102";
+    rev = "8ee11028d72cde7556b31d45f556b40be65b4b70";
+    sha256 = "0f1fpf37ms8d7fhlh3rjzsxsk9w23iyi3phs2i7g561292d5rk3l";
+  };
+}