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-flow/unix.nix

@@ -0,0 +1,22 @@
+{ buildDunePackage, fmt, logs, mirage-flow, ocaml_lwt, cstruct
+, alcotest, mirage-flow-combinators }:
+
+buildDunePackage {
+  pname = "mirage-flow-unix";
+
+  inherit (mirage-flow) version useDune2 src;
+
+  # Make tests compatible with alcotest 1.4.0
+  postPatch = ''
+    substituteInPlace test/test.ml --replace 'Fmt.kstrf Alcotest.fail' 'Fmt.kstrf (fun s -> Alcotest.fail s)'
+  '';
+
+  propagatedBuildInputs = [ fmt logs mirage-flow ocaml_lwt cstruct ];
+
+  doCheck = true;
+  checkInputs = [ alcotest mirage-flow-combinators ];
+
+  meta = mirage-flow.meta // {
+    description = "Flow implementations and combinators for MirageOS on Unix";
+  };
+}