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/default.nix

@@ -0,0 +1,35 @@
+{ lib, buildDunePackage
+, astring, digestif, fmt, jsonm, logs, ocaml_lwt, ocamlgraph, uri
+, repr, ppx_irmin, bheap, uutf
+}:
+
+buildDunePackage {
+  pname = "irmin";
+
+  inherit (ppx_irmin) src version;
+
+  useDune2 = true;
+  minimumOCamlVersion = "4.08";
+
+  propagatedBuildInputs = [
+    astring
+    digestif
+    fmt
+    jsonm
+    logs
+    ocaml_lwt
+    ocamlgraph
+    uri
+    repr
+    bheap
+    ppx_irmin
+    uutf
+  ];
+
+  # circular dependency on irmin-mem
+  doCheck = false;
+
+  meta = ppx_irmin.meta // {
+    description = "A distributed database built on the same principles as Git";
+  };
+}