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/wodan/irmin.nix

@@ -0,0 +1,26 @@
+{ lib, buildDunePackage, io-page-unix, irmin-chunk, irmin-git, irmin-unix
+, mirage-block-ramdisk, mirage-block-unix, wodan }:
+
+buildDunePackage rec {
+  pname = "wodan-irmin";
+  inherit (wodan) version src useDune2;
+
+  propagatedBuildInputs = [
+    io-page-unix
+    irmin-chunk
+    irmin-git
+    irmin-unix
+    mirage-block-ramdisk
+    mirage-block-unix
+    wodan
+  ];
+
+  meta = wodan.meta // {
+    # wodan is currently incompatible with irmin 2.3.0.
+    # additionally upgrading to current master (unclear
+    # if the issue is fixed there) is not possible as it
+    # depends on a custom fork of mirage-block
+    broken = true;
+    description = "Wodan as an Irmin store";
+  };
+}