[ticket/12638] Use require if phpbb_require_updated isn't available

PHPBB3-12638
Merge pull request #2525 from Nicofuma/ticket/12638

[ticket/12638] v30x\local_url_bbcode break the migrations if we don't use the auto updater

* Nicofuma/ticket/12638:
  [ticket/12638] Use require if phpbb_require_updated isn't available