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/xlibs-wrapper/default.nix

@@ -0,0 +1,21 @@
+{lib, stdenv, packages}:
+
+stdenv.mkDerivation {
+  name = "xlibs-wrapper";
+
+  dontBuild = true;
+
+  installPhase = "mkdir -p $out";
+  unpackPhase = "sourceRoot=.";
+
+  propagatedBuildInputs = packages;
+
+  preferLocalBuild = true;
+
+  # For compatability with XFree86.
+  passthru.buildClientLibs = true;
+
+  meta = {
+    platforms = lib.platforms.unix;
+  };
+}