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/irmin/pack.nix

@@ -0,0 +1,26 @@
+{ lib, buildDunePackage
+, alcotest-lwt, index, irmin, irmin-layers, irmin-test, ocaml_lwt, fpath, optint
+}:
+
+buildDunePackage rec {
+  minimumOCamlVersion = "4.02.3";
+
+  pname = "irmin-pack";
+
+  inherit (irmin) version src;
+
+  useDune2 = true;
+
+  buildInputs = [ fpath ];
+  propagatedBuildInputs = [ index irmin irmin-layers ocaml_lwt optint ];
+
+  checkInputs = [ alcotest-lwt irmin-test ];
+
+  doCheck = true;
+
+  meta = irmin.meta // {
+    description = "Irmin backend which stores values in a pack file";
+    mainProgram = "irmin_fsck";
+  };
+
+}