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/cohttp/mirage.nix

@@ -0,0 +1,23 @@
+{ buildDunePackage, cohttp, cohttp-lwt
+, mirage-flow, mirage-channel, mirage-kv
+, conduit, conduit-mirage, lwt
+, astring, magic-mime
+, ppx_sexp_conv
+}:
+
+buildDunePackage {
+  pname = "cohttp-mirage";
+
+  inherit (cohttp) version src minimumOCamlVersion useDune2;
+
+  nativeBuildInputs = [ ppx_sexp_conv ];
+
+  propagatedBuildInputs = [
+    mirage-flow mirage-channel conduit conduit-mirage mirage-kv
+    lwt cohttp cohttp-lwt astring magic-mime
+  ];
+
+  meta = cohttp.meta // {
+    description = "CoHTTP implementation for the MirageOS unikernel";
+  };
+}