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/ff/pbt.nix

@@ -0,0 +1,21 @@
+{ lib, fetchFromGitLab, buildDunePackage, zarith, ff-sig, alcotest }:
+
+buildDunePackage {
+  pname = "ff-pbt";
+  inherit (ff-sig) version src doCheck useDune2;
+
+  minimalOCamlVersion = "4.08";
+
+  checkInputs = [
+    alcotest
+  ];
+
+  propagatedBuildInputs = [
+    zarith
+    ff-sig
+  ];
+
+  meta = ff-sig.meta // {
+    description = "Property based testing library for finite fields over the package ff-sig";
+  };
+}