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/servers/roundcube/plugins/default.nix

@@ -0,0 +1,11 @@
+{ newScope, pkgs }:
+
+let
+
+  callPackage = newScope (pkgs // plugins);
+
+  plugins = import ./plugins.nix { inherit callPackage; };
+
+in
+
+  plugins