Cleanup ZEND_MODULE_API_NO => 20050922
Merge branch 'PHP-5.3' into PHP-5.4

* PHP-5.3:
  Cleanup ZEND_MODULE_API_NO => 20050922
Merge branch 'PHP-5.4' into PHP-5.5

* PHP-5.4:
  Cleanup ZEND_MODULE_API_NO => 20050922
Merge branch 'PHP-5.5' into PHP-5.6

* PHP-5.5:
  Cleanup ZEND_MODULE_API_NO => 20050922
Merge branch 'PHP-5.6' of https://git.php.net/push/php-src into PHP-5.6

* 'PHP-5.6' of https://git.php.net/push/php-src:
  Fix crashes in GMP serialize/unserialize
  enable gmp for tests