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/irmin/git.nix

@@ -0,0 +1,38 @@
+{ lib, buildDunePackage
+, git, irmin, irmin-test, ppx_irmin, git-cohttp-unix, git-unix
+, digestif, cstruct, fmt, astring, fpath, logs, lwt, uri
+, mtime, alcotest, cacert
+}:
+
+buildDunePackage {
+
+  pname = "irmin-git";
+
+  inherit (irmin) version src;
+
+  useDune2 = true;
+
+  propagatedBuildInputs = [
+    git
+    irmin
+    ppx_irmin
+    digestif
+    cstruct
+    fmt
+    astring
+    fpath
+    logs
+    lwt
+    uri
+  ];
+
+  checkInputs = [ mtime alcotest git-cohttp-unix git-unix irmin-test cacert ];
+
+  doCheck = true;
+
+  meta = irmin.meta // {
+    description = "Git backend for Irmin";
+  };
+
+}
+