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/nix/npins/default.nix

@@ -0,0 +1,44 @@
+{ lib
+, rustPlatform
+, fetchFromGitHub
+, nix-gitignore
+, makeWrapper
+, stdenv
+, darwin
+, callPackage
+
+  # runtime dependencies
+, nix # for nix-prefetch-url
+, nix-prefetch-git
+, git # for git ls-remote
+}:
+
+let
+  runtimePath = lib.makeBinPath [ nix nix-prefetch-git git ];
+  sources = (builtins.fromJSON (builtins.readFile ./sources.json)).pins;
+in rustPlatform.buildRustPackage rec {
+  pname = "npins";
+  version = src.version;
+  src = passthru.mkSource sources.npins;
+
+  cargoSha256 = "0rwnzkmx91cwcz9yw0rbbqv73ba6ggim9f4qgz5pgy6h696ld2k8";
+
+  buildInputs = lib.optional stdenv.isDarwin (with darwin.apple_sdk.frameworks; [ Security ]);
+  nativeBuildInputs = [ makeWrapper ];
+
+  # (Almost) all tests require internet
+  doCheck = false;
+
+  postFixup = ''
+    wrapProgram $out/bin/npins --prefix PATH : "${runtimePath}"
+  '';
+
+  meta = with lib; {
+    description = "Simple and convenient dependency pinning for Nix";
+    homepage = "https://github.com/andir/npins";
+    license = licenses.eupl12;
+    maintainers = with maintainers; [ piegames ];
+  };
+
+  passthru.mkSource = callPackage ./source.nix {};
+}