Refer to Zend Optimizer as Zend Opcache from now on
Backported fix for bug #62852
Merge branch 'PHP-5.3' into PHP-5.4

* PHP-5.3:
  Backported fix for bug #62852
Merge branch 'PHP-5.4' into PHP-5.5

* PHP-5.4:
  Backported fix for bug #62852