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/bitstring/ppx.nix

@@ -0,0 +1,22 @@
+{ lib, buildDunePackage, ocaml
+, bitstring, ppxlib
+, ounit
+}:
+
+if lib.versionOlder ppxlib.version "0.18.0"
+then throw "ppx_bitstring is not available with ppxlib-${ppxlib.version}"
+else
+
+buildDunePackage rec {
+  pname = "ppx_bitstring";
+  inherit (bitstring) version useDune2 src;
+
+  buildInputs = [ bitstring ppxlib ];
+
+  doCheck = lib.versionAtLeast ocaml.version "4.08";
+  checkInputs = [ ounit ];
+
+  meta = bitstring.meta // {
+    description = "Bitstrings and bitstring matching for OCaml - PPX extension";
+  };
+}