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-mirage.nix

@@ -0,0 +1,22 @@
+{ buildDunePackage, mirage-crypto-rng, duration, cstruct, mirage-runtime
+, mirage-time, mirage-clock, mirage-unix, mirage-time-unix, mirage-clock-unix
+, logs, lwt
+}:
+
+buildDunePackage rec {
+  pname = "mirage-crypto-rng-mirage";
+
+  inherit (mirage-crypto-rng) version src useDune2 minimumOCamlVersion;
+
+  doCheck = true;
+  checkInputs = [ mirage-unix mirage-clock-unix mirage-time-unix ];
+
+  propagatedBuildInputs = [ duration cstruct mirage-crypto-rng mirage-runtime
+                            mirage-time mirage-clock logs lwt ];
+
+  strictDeps = !doCheck;
+
+  meta = mirage-crypto-rng.meta // {
+    description = "Entropy collection for a cryptographically secure PRNG";
+  };
+}