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/development/tools/dockfmt/default.nix

@@ -0,0 +1,31 @@
+{ lib
+, buildGoModule
+, fetchFromGitHub
+}:
+
+buildGoModule rec {
+  pname = "dockfmt";
+  version = "0.3.3";
+
+  src = fetchFromGitHub {
+    owner = "jessfraz";
+    repo = "dockfmt";
+    rev = "v${version}";
+    sha256 = "0m56ydmf7zbcsa5yym7j5fgr75v677h9s40zyzwrqccyq01myp06";
+  };
+
+  vendorSha256 = null;
+
+  ldflags = [
+    "-w"
+    "-s"
+    "-X github.com/jessfraz/dockfmt/version.VERSION=${version}"
+  ];
+
+  meta = with lib; {
+    description = "Dockerfile format";
+    homepage = "https://github.com/jessfraz/dockfmt";
+    license = [ licenses.mit ];
+    maintainers = [ maintainers.cpcloud ];
+  };
+}