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/ringo/lwt.nix

@@ -0,0 +1,17 @@
+{ lib, buildDunePackage, ringo, lwt }:
+
+buildDunePackage {
+  pname = "ringo-lwt";
+  inherit (ringo) version src doCheck useDune2;
+
+  minimalOCamlVersion = "4.08";
+
+  propagatedBuildInputs = [
+    ringo
+    lwt
+  ];
+
+  meta = ringo.meta // {
+    description = "Lwt-wrappers for Ringo caches";
+  };
+}