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/cow/default.nix

@@ -0,0 +1,30 @@
+{ lib, fetchurl, buildDunePackage, alcotest
+, uri, xmlm, omd, ezjsonm }:
+
+buildDunePackage rec {
+  useDune2 = true;
+  minimumOCamlVersion = "4.02.3";
+
+  version = "2.4.0";
+  pname = "cow";
+
+  src = fetchurl {
+    url = "https://github.com/mirage/ocaml-cow/releases/download/v${version}/cow-v${version}.tbz";
+    sha256 = "1x77lwpskda4zyikwxh500xjn90pgdwz6jm7ca7f36pyav4vl6zx";
+  };
+
+  propagatedBuildInputs = [ xmlm uri ezjsonm omd ];
+  checkInputs = [ alcotest ];
+  doCheck = true;
+
+  meta = with lib; {
+    description = "Caml on the Web";
+    longDescription = ''
+      Writing web-applications requires a lot of skills: HTML, XML, JSON and
+      Markdown, to name but a few! This library provides OCaml combinators
+      for these web formats.
+    '';
+    license = licenses.isc;
+    maintainers = [ maintainers.sternenseemann ];
+  };
+}