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/test.nix

@@ -0,0 +1,21 @@
+{ buildDunePackage
+, alcotest, cmdliner, irmin, metrics-unix, mtime, irmin-layers
+}:
+
+buildDunePackage {
+
+  pname = "irmin-test";
+
+  inherit (irmin) version src;
+
+  useDune2 = true;
+
+  propagatedBuildInputs = [
+    alcotest cmdliner irmin metrics-unix mtime irmin-layers
+  ];
+
+  meta = irmin.meta // {
+    description = "Irmin test suite";
+  };
+
+}