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/security/rtkit.nix

@@ -0,0 +1,47 @@
+# A module for ‘rtkit’, a DBus system service that hands out realtime
+# scheduling priority to processes that ask for it.
+
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+{
+
+  options = {
+
+    security.rtkit.enable = mkOption {
+      type = types.bool;
+      default = false;
+      description = ''
+        Whether to enable the RealtimeKit system service, which hands
+        out realtime scheduling priority to user processes on
+        demand. For example, the PulseAudio server uses this to
+        acquire realtime priority.
+      '';
+    };
+
+  };
+
+
+  config = mkIf config.security.rtkit.enable {
+
+    security.polkit.enable = true;
+
+    # To make polkit pickup rtkit policies
+    environment.systemPackages = [ pkgs.rtkit ];
+
+    systemd.packages = [ pkgs.rtkit ];
+
+    services.dbus.packages = [ pkgs.rtkit ];
+
+    users.users.rtkit =
+      {
+        isSystemUser = true;
+        group = "rtkit";
+        description = "RealtimeKit daemon";
+      };
+    users.groups.rtkit = {};
+
+  };
+
+}