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/cataclysm-dda/lib.nix

@@ -0,0 +1,46 @@
+{ callPackage }:
+
+rec {
+  buildMod = callPackage ./builder.nix {
+    type = "mod";
+  };
+
+  buildSoundPack = callPackage ./builder.nix {
+    type = "soundpack";
+  };
+
+  buildTileSet = callPackage ./builder.nix {
+    type = "tileset";
+  };
+
+  wrapCDDA = callPackage ./wrapper.nix {};
+
+  # Required to fix `pkgs` and `withMods` attrs after applying `overrideAttrs`.
+  #
+  # Example:
+  #     let
+  #       myBuild = cataclysmDDA.jenkins.latest.tiles.overrideAttrs (_: {
+  #         x = "hello";
+  #       });
+  #
+  #       # This refers to the derivation before overriding! So, `badExample.x` is not accessible.
+  #       badExample = myBuild.withMods (_: []);
+  #
+  #       # `myBuild` is correctly referred by `withMods` and `goodExample.x` is accessible.
+  #       goodExample = let
+  #         inherit (cataclysmDDA) attachPkgs pkgs;
+  #       in
+  #       (attachPkgs pkgs myBuild).withMods (_: []);
+  #     in
+  #     goodExample.x  # returns "hello"
+  attachPkgs = pkgs: super:
+  let
+    self = super.overrideAttrs (old: {
+      passthru = old.passthru // {
+        pkgs = pkgs.override { build = self; };
+        withMods = wrapCDDA self;
+      };
+    });
+  in
+  self;
+}