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/libobjc.nix

@@ -0,0 +1,21 @@
+{ stdenvNoCC, MacOSX-SDK, libcharset }:
+
+let self = stdenvNoCC.mkDerivation {
+  pname = "libobjc";
+  version = MacOSX-SDK.version;
+
+  dontUnpack = true;
+  dontBuild = true;
+
+  installPhase = ''
+    mkdir -p $out/{include,lib}
+    cp -r ${MacOSX-SDK}/usr/include/objc $out/include
+    cp ${MacOSX-SDK}/usr/lib/libobjc* $out/lib
+  '';
+
+  passthru = {
+    tbdRewrites = {
+      const."/usr/lib/libobjc.A.dylib" = "${self}/lib/libobjc.A.dylib";
+    };
+  };
+}; in self