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/awa/lwt.nix

@@ -0,0 +1,15 @@
+{ buildDunePackage, awa
+, cstruct, mtime, lwt, cstruct-unix, mirage-crypto-rng
+}:
+
+buildDunePackage {
+  pname = "awa-lwt";
+
+  inherit (awa) version src useDune2;
+
+  propagatedBuildInputs = [
+    awa cstruct mtime lwt cstruct-unix mirage-crypto-rng
+  ];
+
+  meta = awa.meta // { mainProgram = "awa_lwt_server"; };
+}