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/opium/default.nix

@@ -0,0 +1,32 @@
+{ buildDunePackage
+
+, ppx_sexp_conv
+, ppx_fields_conv
+
+, cmdliner
+, cohttp-lwt-unix
+, logs
+, magic-mime
+, opium_kernel
+, stringext
+
+, alcotest
+}:
+
+buildDunePackage {
+  pname = "opium";
+  inherit (opium_kernel) version src meta minimumOCamlVersion;
+
+  useDune2 = true;
+
+  doCheck = true;
+
+  buildInputs = [
+    ppx_sexp_conv ppx_fields_conv
+    alcotest
+  ];
+
+  propagatedBuildInputs = [
+    opium_kernel cmdliner cohttp-lwt-unix magic-mime logs stringext
+  ];
+}