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>

nixos/modules/services/networking/hylafax/default.nix

@@ -0,0 +1,31 @@
+{ config, lib, pkgs, ... }:
+
+{
+
+  imports = [
+    ./options.nix
+    ./systemd.nix
+  ];
+
+  config = lib.modules.mkIf config.services.hylafax.enable {
+    environment.systemPackages = [ pkgs.hylafaxplus ];
+    users.users.uucp = {
+      uid = config.ids.uids.uucp;
+      group = "uucp";
+      description = "Unix-to-Unix CoPy system";
+      isSystemUser = true;
+      inherit (config.users.users.nobody) home;
+    };
+    assertions = [{
+      assertion = config.services.hylafax.modems != {};
+      message = ''
+        HylaFAX cannot be used without modems.
+        Please define at least one modem with
+        <option>config.services.hylafax.modems</option>.
+      '';
+    }];
+  };
+
+  meta.maintainers = [ lib.maintainers.yarny ];
+
+}