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/ethernet/default.nix

@@ -0,0 +1,42 @@
+{ lib, buildDunePackage, fetchurl
+, rresult, cstruct, ppx_cstruct, mirage-net, mirage-protocols
+, mirage-profile, macaddr, fmt, lwt, logs
+}:
+
+buildDunePackage rec {
+  pname = "ethernet";
+  version = "3.0.0";
+
+  minimumOCamlVersion = "4.08";
+
+  # necessary due to cstruct
+  useDune2 = true;
+
+  src = fetchurl {
+    url = "https://github.com/mirage/${pname}/releases/download/v${version}/${pname}-v${version}.tbz";
+    sha256 = "0a898vp9dw42majsvzzvs8pc6x4ns01wlwhwbacixliv6vv78ng9";
+  };
+
+  nativeBuildInputs = [
+    ppx_cstruct
+  ];
+
+  propagatedBuildInputs = [
+    rresult
+    cstruct
+    mirage-net
+    mirage-protocols
+    macaddr
+    mirage-profile
+    fmt
+    lwt
+    logs
+  ];
+
+  meta = with lib; {
+    description = "OCaml Ethernet (IEEE 802.3) layer, used in MirageOS";
+    homepage = "https://github.com/mirage/ethernet";
+    license = licenses.isc;
+    maintainers = [ maintainers.sternenseemann ];
+  };
+}