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/window-managers/ratpoison.nix

@@ -0,0 +1,25 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let
+  cfg = config.services.xserver.windowManager.ratpoison;
+in
+{
+  ###### interface
+  options = {
+    services.xserver.windowManager.ratpoison.enable = mkEnableOption "ratpoison";
+  };
+
+  ###### implementation
+  config = mkIf cfg.enable {
+    services.xserver.windowManager.session = singleton {
+      name = "ratpoison";
+      start = ''
+        ${pkgs.ratpoison}/bin/ratpoison &
+        waitPID=$!
+      '';
+    };
+    environment.systemPackages = [ pkgs.ratpoison ];
+  };
+}