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-async.nix

@@ -0,0 +1,27 @@
+{ lib, buildDunePackage
+, mirage-crypto, mirage-crypto-rng
+, dune-configurator, async, logs
+}:
+
+buildDunePackage {
+  pname = "mirage-crypto-rng-async";
+
+  inherit (mirage-crypto) useDune2 version minimumOCamlVersion src;
+
+  buildInputs = [
+    dune-configurator
+  ];
+
+  propagatedBuildInputs = [
+    async
+    logs
+    mirage-crypto
+    mirage-crypto-rng
+  ];
+
+  strictDeps = true;
+
+  meta = mirage-crypto.meta // {
+    description = "Feed the entropy source in an Async-friendly way";
+  };
+}