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/x11/hardware/wacom.nix

@@ -0,0 +1,48 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let
+
+  cfg = config.services.xserver.wacom;
+
+in
+
+{
+
+  options = {
+
+    services.xserver.wacom = {
+
+      enable = mkOption {
+        type = types.bool;
+        default = false;
+        description = ''
+          Whether to enable the Wacom touchscreen/digitizer/tablet.
+          If you ever have any issues such as, try switching to terminal (ctrl-alt-F1) and back
+          which will make Xorg reconfigure the device ?
+
+          If you're not satisfied by the default behaviour you can override
+          <option>environment.etc."X11/xorg.conf.d/70-wacom.conf"</option> in
+          configuration.nix easily.
+        '';
+      };
+
+    };
+
+  };
+
+
+  config = mkIf cfg.enable {
+
+    environment.systemPackages = [ pkgs.xf86_input_wacom ]; # provides xsetwacom
+
+    services.xserver.modules = [ pkgs.xf86_input_wacom ];
+
+    services.udev.packages = [ pkgs.xf86_input_wacom ];
+
+    environment.etc."X11/xorg.conf.d/70-wacom.conf".source = "${pkgs.xf86_input_wacom}/share/X11/xorg.conf.d/70-wacom.conf";
+
+  };
+
+}