Zend Engine 3
Removed ZEND_ENGINE_2 checks (and ZE1 code, it's been a decade!)
Note macro removal in UPGRADING.INTERNALS
Restored zip/oci8 PHP 4 code, add PHP 7 checks
Merge branch 'ZendEngine3'

* ZendEngine3:
  Restored zip/oci8 PHP 4 code, add PHP 7 checks
  Note macro removal in UPGRADING.INTERNALS
  Removed ZEND_ENGINE_2 checks (and ZE1 code, it's been a decade!)
  Zend Engine 3