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/herbstluftwm.nix

@@ -0,0 +1,47 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let
+  cfg = config.services.xserver.windowManager.herbstluftwm;
+in
+
+{
+  options = {
+    services.xserver.windowManager.herbstluftwm = {
+      enable = mkEnableOption "herbstluftwm";
+
+      package = mkOption {
+        type = types.package;
+        default = pkgs.herbstluftwm;
+        defaultText = literalExpression "pkgs.herbstluftwm";
+        description = ''
+          Herbstluftwm package to use.
+        '';
+      };
+
+      configFile = mkOption {
+        default     = null;
+        type        = with types; nullOr path;
+        description = ''
+          Path to the herbstluftwm configuration file.  If left at the
+          default value, $XDG_CONFIG_HOME/herbstluftwm/autostart will
+          be used.
+        '';
+      };
+    };
+  };
+
+  config = mkIf cfg.enable {
+    services.xserver.windowManager.session = singleton {
+      name = "herbstluftwm";
+      start =
+        let configFileClause = optionalString
+            (cfg.configFile != null)
+            ''-c "${cfg.configFile}"''
+            ;
+        in "${cfg.package}/bin/herbstluftwm ${configFileClause}";
+    };
+    environment.systemPackages = [ cfg.package ];
+  };
+}