remove only internally used function from interface

lib/user/interface.php

@@ -23,15 +23,6 @@
 
 interface OC_User_Interface {
 
-	/**
-	* @brief Get all supported actions
-	* @returns bitwise-or'ed actions
-	*
-	* Returns the supported actions as int to be
-	* compared with OC_USER_BACKEND_CREATE_USER etc.
-	*/
-	public function getSupportedActions();
-
 	/**
 	* @brief Check if backend implements actions
 	* @param $actions bitwise-or'ed actions