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/networking/cocom/default.nix

@@ -0,0 +1,32 @@
+{ lib
+, stdenv
+, fetchFromGitHub
+, rustPlatform
+, Security
+}:
+
+rustPlatform.buildRustPackage rec {
+  pname = "cocom";
+  version = "1.1.3";
+
+  src = fetchFromGitHub {
+    owner = "LamdaLamdaLamda";
+    repo = pname;
+    rev = "v${version}";
+    sha256 = "0sl4ivn95sr5pgw2z877gmhyfc4mk9xr457i5g2i4wqnf2jmy14j";
+  };
+
+  cargoSha256 = "04kj1yj6hhnis3ss0xs4zq8rl71rzn577g8i0wmapkjqzqwg37yb";
+
+  buildInputs = lib.optional stdenv.isDarwin Security;
+
+  # Tests require network access
+  doCheck = false;
+
+  meta = with lib; {
+    description = "NTP client";
+    homepage = "https://github.com/LamdaLamdaLamda/cocom";
+    license = licenses.gpl3Only;
+    maintainers = with maintainers; [ fab ];
+  };
+}