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/os-specific/darwin/DarwinTools/default.nix

@@ -0,0 +1,36 @@
+{ lib, stdenv, fetchurl }:
+
+stdenv.mkDerivation rec {
+  pname = "DarwinTools";
+  version = "1";
+
+  src = fetchurl {
+    url = "https://opensource.apple.com/tarballs/DarwinTools/DarwinTools-${version}.tar.gz";
+    sha256 = "0hh4jl590jv3v830p77r3jcrnpndy7p2b8ajai3ldpnx2913jfhp";
+  };
+
+  patches = [
+    ./sw_vers-CFPriv.patch
+  ];
+
+  postPatch = ''
+    substituteInPlace Makefile \
+      --replace gcc cc
+  '';
+
+  configurePhase = ''
+    export SRCROOT=.
+    export SYMROOT=.
+    export DSTROOT=$out
+  '';
+
+  postInstall = ''
+    mv $out/usr/* $out
+    rmdir $out/usr
+  '';
+
+  meta = {
+    maintainers = [ lib.maintainers.matthewbauer ];
+    platforms = lib.platforms.darwin;
+  };
+}