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/shared-memory-ring/lwt.nix

@@ -0,0 +1,37 @@
+{ lib
+, buildDunePackage
+, shared-memory-ring
+, ppx_cstruct
+, cstruct
+, lwt
+, lwt-dllist
+, mirage-profile
+, ounit
+}:
+
+buildDunePackage {
+  pname = "shared-memory-ring-lwt";
+
+  inherit (shared-memory-ring) version src useDune2;
+
+  buildInputs = [
+    ppx_cstruct
+  ];
+
+  propagatedBuildInputs = [
+    shared-memory-ring
+    cstruct
+    lwt
+    lwt-dllist
+    mirage-profile
+  ];
+
+  doCheck = true;
+  checkInputs = [
+    ounit
+  ];
+
+  meta = shared-memory-ring.meta // {
+    description = "Shared memory rings for RPC and bytestream communications using Lwt";
+  };
+}