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/bls12-381/unix.nix

@@ -0,0 +1,34 @@
+{ lib
+, buildDunePackage
+, bls12-381
+, hex
+, integers
+, zarith
+, alcotest
+, bisect_ppx
+, ff-pbt
+}:
+
+buildDunePackage {
+  pname = "bls12-381-unix";
+
+  inherit (bls12-381) version src useDune2 doCheck;
+
+  propagatedBuildInputs = [
+    bls12-381
+    hex
+    integers
+    zarith
+  ];
+
+  checkInputs = [
+    alcotest
+    bisect_ppx
+    ff-pbt
+  ];
+
+  meta = {
+    description = "UNIX version of BLS12-381 primitives implementing the virtual package bls12-381";
+    license = lib.licenses.mit;
+  };
+}