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/libraries/metal/default.nix

@@ -0,0 +1,23 @@
+{ lib, stdenv, fetchFromGitHub, cmake }:
+stdenv.mkDerivation rec {
+  pname = "metal";
+  version = "2.1.2";
+
+  src = fetchFromGitHub {
+    owner = "brunocodutra";
+    repo = "metal";
+    rev = "v${version}";
+    sha256 = "sha256-1I+EZtIz/2y4+dJGBONhTlUQGHgRdvXc1ZAOC9pmStw=";
+  };
+
+  nativeBuildInputs = [ cmake ];
+
+  meta = with lib; {
+    description = "Single-header C++11 library designed to make you love template metaprogramming";
+    homepage = "https://github.com/brunocodutra/metal";
+    license = licenses.mit;
+    maintainers = with maintainers; [ pmiddend ];
+    platforms = platforms.all;
+  };
+
+}