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/macaddr/sexp.nix

@@ -0,0 +1,18 @@
+{ lib, buildDunePackage
+, macaddr, ppx_sexp_conv, macaddr-cstruct, ounit
+}:
+
+buildDunePackage {
+  pname = "macaddr-sexp";
+
+  inherit (macaddr) version src;
+
+  propagatedBuildInputs = [ ppx_sexp_conv ];
+
+  checkInputs = [ macaddr-cstruct ounit ];
+  doCheck = true;
+
+  meta = macaddr.meta // {
+    description = "A library for manipulation of MAC address representations using sexp";
+  };
+}