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-crypto/rng.nix

@@ -0,0 +1,20 @@
+{ buildDunePackage, mirage-crypto, ounit, randomconv, dune-configurator
+, cstruct, duration, logs, mtime, ocaml_lwt }:
+
+buildDunePackage rec {
+  pname = "mirage-crypto-rng";
+
+  inherit (mirage-crypto) version src useDune2 minimumOCamlVersion;
+
+  doCheck = true;
+  checkInputs = [ ounit randomconv ];
+
+  buildInputs = [ dune-configurator ];
+  propagatedBuildInputs = [ cstruct mirage-crypto duration logs mtime ocaml_lwt ];
+
+  strictDeps = !doCheck;
+
+  meta = mirage-crypto.meta // {
+    description = "A cryptographically secure PRNG";
+  };
+}