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/mirage-clock/freestanding.nix

@@ -0,0 +1,23 @@
+{ lib
+, buildDunePackage
+, mirage-clock
+}:
+
+buildDunePackage {
+  pname = "mirage-clock-freestanding";
+
+  inherit (mirage-clock)
+    version
+    src
+    useDune2
+    minimumOCamlVersion
+    ;
+
+  propagatedBuildInputs = [
+    mirage-clock
+  ];
+
+  meta = mirage-clock.meta // {
+    description = "Paravirtual implementation of the MirageOS Clock interface";
+  };
+}