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/misc/packagekit.nix

@@ -0,0 +1,74 @@
+{ config, lib, pkgs, ... }:
+
+let
+  cfg = config.services.packagekit;
+
+  inherit (lib)
+    mkEnableOption mkOption mkIf mkRemovedOptionModule types
+    listToAttrs recursiveUpdate;
+
+  iniFmt = pkgs.formats.ini { };
+
+  confFiles = [
+    (iniFmt.generate "PackageKit.conf" (recursiveUpdate
+      {
+        Daemon = {
+          DefaultBackend = "nix";
+          KeepCache = false;
+        };
+      }
+      cfg.settings))
+
+    (iniFmt.generate "Vendor.conf" (recursiveUpdate
+      {
+        PackagesNotFound = rec {
+          DefaultUrl = "https://github.com/NixOS/nixpkgs";
+          CodecUrl = DefaultUrl;
+          HardwareUrl = DefaultUrl;
+          FontUrl = DefaultUrl;
+          MimeUrl = DefaultUrl;
+        };
+      }
+      cfg.vendorSettings))
+  ];
+
+in
+{
+  imports = [
+    (mkRemovedOptionModule [ "services" "packagekit" "backend" ] "Always set to Nix.")
+  ];
+
+  options.services.packagekit = {
+    enable = mkEnableOption ''
+      PackageKit provides a cross-platform D-Bus abstraction layer for
+      installing software. Software utilizing PackageKit can install
+      software regardless of the package manager.
+    '';
+
+    settings = mkOption {
+      type = iniFmt.type;
+      default = { };
+      description = "Additional settings passed straight through to PackageKit.conf";
+    };
+
+    vendorSettings = mkOption {
+      type = iniFmt.type;
+      default = { };
+      description = "Additional settings passed straight through to Vendor.conf";
+    };
+  };
+
+  config = mkIf cfg.enable {
+
+    services.dbus.packages = with pkgs; [ packagekit ];
+
+    environment.systemPackages = with pkgs; [ packagekit ];
+
+    systemd.packages = with pkgs; [ packagekit ];
+
+    environment.etc = listToAttrs (map
+      (e:
+        lib.nameValuePair "PackageKit/${e.name}" { source = e; })
+      confFiles);
+  };
+}