Performance Fix zendframework#737

unsetting a non-existing rule doesn't throw an error.
In our Project this change improves loading time from 55 sec to 0.5 sec
(14412 Resources, 11694 Rules)

Author: tavy315

library/Zend/Acl.php

@@ -481,11 +481,7 @@ public function remove($resource)
     public function removeAll()
     {
         foreach ($this->_resources as $resourceId => $resource) {
-            foreach ($this->_rules['byResourceId'] as $resourceIdCurrent => $rules) {
-                if ($resourceId === $resourceIdCurrent) {
-                    unset($this->_rules['byResourceId'][$resourceIdCurrent]);
-                }
-            }
+            unset($this->_rules['byResourceId'][$resourceId]);
         }
 
         $this->_resources = array();