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/ocaml-modules/ounit/default.nix

@@ -0,0 +1,18 @@
+{ stdenv, ocaml, findlib, ounit2 }:
+
+stdenv.mkDerivation {
+  pname = "ocaml${ocaml.version}-ounit";
+  inherit (ounit2) version src meta;
+
+  nativeBuildInputs = [ findlib ];
+  propagatedBuildInputs = [ ounit2 ];
+
+  strictDeps = true;
+
+  dontBuild = true;
+
+  createFindlibDestdir = true;
+
+  installTargets = "install-ounit version='${ounit2.version}'";
+
+}