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/programs/dconf.nix

@@ -0,0 +1,66 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let
+  cfg = config.programs.dconf;
+  cfgDir = pkgs.symlinkJoin {
+    name = "dconf-system-config";
+    paths = map (x: "${x}/etc/dconf") cfg.packages;
+    postBuild = ''
+      mkdir -p $out/profile
+      mkdir -p $out/db
+    '' + (
+      concatStringsSep "\n" (
+        mapAttrsToList (
+          name: path: ''
+            ln -s ${path} $out/profile/${name}
+          ''
+        ) cfg.profiles
+      )
+    ) + ''
+      ${pkgs.dconf}/bin/dconf update $out/db
+    '';
+  };
+in
+{
+  ###### interface
+
+  options = {
+    programs.dconf = {
+      enable = mkEnableOption "dconf";
+
+      profiles = mkOption {
+        type = types.attrsOf types.path;
+        default = {};
+        description = "Set of dconf profile files, installed at <filename>/etc/dconf/profiles/<replaceable>name</replaceable></filename>.";
+        internal = true;
+      };
+
+      packages = mkOption {
+        type = types.listOf types.package;
+        default = [];
+        description = "A list of packages which provide dconf profiles and databases in <filename>/etc/dconf</filename>.";
+      };
+    };
+  };
+
+  ###### implementation
+
+  config = mkIf (cfg.profiles != {} || cfg.enable) {
+    environment.etc.dconf = mkIf (cfg.profiles != {} || cfg.packages != []) {
+      source = cfgDir;
+    };
+
+    services.dbus.packages = [ pkgs.dconf ];
+
+    systemd.packages = [ pkgs.dconf ];
+
+    # For dconf executable
+    environment.systemPackages = [ pkgs.dconf ];
+
+    # Needed for unwrapped applications
+    environment.sessionVariables.GIO_EXTRA_MODULES = mkIf cfg.enable [ "${pkgs.dconf.lib}/lib/gio/modules" ];
+  };
+
+}