Bugfix: Apache2 plugin uses app->system before including it.

server/plugins-available/apache2_plugin.inc.php

@@ -1355,6 +1355,7 @@ class apache2_plugin {
 
 		// load the server configuration options
 		$app->uses('getconf');
+		$app->uses('system');
 		$web_config = $app->getconf->get_server_config($conf['server_id'], 'web');
 		
 		$app->system->web_folder_protection($data['new']['document_root'],false);
@@ -2336,4 +2337,4 @@ class apache2_plugin {
 
 } // end class
 
-?>
\ No newline at end of file
+?>