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/dwarf-fortress/themes/default.nix

@@ -0,0 +1,21 @@
+{ lib, fetchFromGitHub, ... }:
+
+with builtins;
+
+listToAttrs (map
+  (v: {
+    inherit (v) name;
+    value = fetchFromGitHub {
+      name = "${v.name}-theme-${v.version}";
+      owner = "DFgraphics";
+      repo = v.name;
+      rev = v.version;
+      sha256 = v.sha256;
+      meta = with lib; {
+        platforms = platforms.all;
+        maintainers = [ maintainers.matthewbauer maintainers.shazow ];
+        license = licenses.free;
+      };
+    };
+  })
+  (fromJSON (readFile ./themes.json)))