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/stubs/default.nix

@@ -0,0 +1,15 @@
+{ lib, writeScriptBin, runtimeShell }:
+
+let fake = name: lib.overrideDerivation (writeScriptBin name ''
+  #!${runtimeShell}
+  echo >&2 "Faking call to ${name} with arguments:"
+  echo >&2 "$@"
+'') (drv: {
+  name = "${name}-stub";
+}); in
+
+{
+  setfile = fake "SetFile";
+  rez = fake "Rez";
+  derez = fake "DeRez";
+}