Log Message:
Update php70 to 7.0.20.

8 Jun 2017 PHP 7.0.20

- Core:
  . Fixed bug #74600 (crash (SIGSEGV) in _zend_hash_add_or_update_i).
    (Laruence)
  . Fixed bug #74546 (SIGILL in ZEND_FETCH_CLASS_CONSTANT_SPEC_CONST_CONST).
    (Laruence)

- intl:
  . Fixed bug #74468 (wrong reflection on Collator::sortWithSortKeys). (villfa)

- MySQLi:
  . Fixed bug #74547 (mysqli::change_user() doesn't accept null as $database
    argument w/strict_types). (Anatol)

- Opcache:
  . Fixed bug #74596 (SIGSEGV with opcache.revalidate_path enabled). (Laruence)

- phar:
  . Fixed bug #51918 (Phar::webPhar() does not handle requests sent through PUT
    and DELETE method). (Christian Weiske)

- Standard:
  . Fixed bug #74510 (win32/sendmail.c anchors CC header but not BCC).
    (Damian Wadley, Anatol)

- xmlreader:
  . Fixed bug #74457 (Wrong reflection on XMLReader::expand). (villfa)