Don't try to keep backwards-compatibility with the old factory
style, which doesn't map cleanly onto supported options (we only
have ONLY_PHP7/PREFER_PHP7, which should probably create a Php8
parser in terms of how they are used, but this would no longer
match their names).
Instead, I have backported the new createForNewestSupportedVersion()
and createForHostVersion() methods to PHP-Parser 4.
3640d18b87