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/data-encoding/default.nix

@@ -0,0 +1,46 @@
+{ lib
+, fetchFromGitLab
+, buildDunePackage
+, ezjsonm
+, zarith
+, hex
+, json-data-encoding
+, json-data-encoding-bson
+, alcotest
+, crowbar
+}:
+
+buildDunePackage {
+  pname = "data-encoding";
+  version = "0.4.0";
+
+  src = fetchFromGitLab {
+    owner = "nomadic-labs";
+    repo = "data-encoding";
+    rev = "v0.4";
+    sha256 = "1f88l9azpfk730hps5v6zlg4yyyyhj1gl27qy3cbbkzjc82d2rhx";
+  };
+  useDune2 = true;
+
+  propagatedBuildInputs = [
+    ezjsonm
+    zarith
+    hex
+    json-data-encoding
+    json-data-encoding-bson
+  ];
+
+  checkInputs = [
+    alcotest
+    crowbar
+  ];
+
+  doCheck = true;
+
+  meta = {
+    homepage = "https://gitlab.com/nomadic-labs/data-encoding";
+    description = "Library of JSON and binary encoding combinators";
+    license = lib.licenses.mit;
+    maintainers = [ lib.maintainers.ulrikstrid ];
+  };
+}