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/tools/misc/docker-sync/default.nix

@@ -0,0 +1,20 @@
+{ lib, ruby, bundlerApp, bundlerUpdateScript }:
+
+bundlerApp {
+  pname = "docker-sync";
+  gemdir = ./.;
+
+  inherit ruby;
+
+  exes = ["docker-sync"];
+
+  passthru.updateScript = bundlerUpdateScript "docker-sync";
+
+  meta = with lib; {
+    description = "Run your application at full speed while syncing your code for development";
+    homepage = "http://docker-sync.io";
+    license = licenses.gpl3;
+    maintainers = with maintainers; [ manveru nicknovitski ];
+    platforms = platforms.unix;
+  };
+}