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/apple-sdk-11.0/libcharset.nix

@@ -0,0 +1,16 @@
+{ stdenvNoCC, buildPackages, MacOSX-SDK }:
+
+stdenvNoCC.mkDerivation {
+  pname = "libcharset";
+  version = MacOSX-SDK.version;
+
+  dontUnpack = true;
+  dontBuild = true;
+
+  nativeBuildInputs = [ buildPackages.darwin.checkReexportsHook ];
+
+  installPhase = ''
+    mkdir -p $out/{include,lib}
+    cp ${MacOSX-SDK}/usr/lib/libcharset* $out/lib
+  '';
+}