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/applications/virtualization/docker/gc.nix

@@ -0,0 +1,33 @@
+{ stdenv, lib, fetchFromGitHub, makeWrapper, docker, coreutils, procps, gnused, findutils, gnugrep }:
+
+with lib;
+
+stdenv.mkDerivation rec {
+  pname = "docker-gc";
+  version = "unstable-2015-10-5";
+
+  src = fetchFromGitHub {
+    owner = "spotify";
+    repo = "docker-gc";
+    rev = "b0cc52aa3da2e2ac0080794e0be6e674b1f063fc";
+    sha256 = "07wf9yn0f771xkm3x12946x5rp83hxjkd70xgfgy35zvj27wskzm";
+  };
+
+  nativeBuildInputs = [ makeWrapper ];
+
+  installPhase = ''
+    mkdir -p $out/bin
+    cp docker-gc $out/bin
+    chmod +x $out/bin/docker-gc
+    wrapProgram $out/bin/docker-gc \
+        --prefix PATH : "${lib.makeBinPath [ docker coreutils procps gnused findutils gnugrep ]}"
+  '';
+
+  meta = {
+    description = "Docker garbage collection of containers and images";
+    license = licenses.asl20;
+    homepage = "https://github.com/spotify/docker-gc";
+    maintainers = with maintainers; [offline];
+    platforms = docker.meta.platforms;
+  };
+}