[ticket/10917] Fixed notice that files are out of date when updating to an unreleased version

PHPBB3-10917
[ticket/10917] Using phpbb wrapper

PHPBB3-10917
Merge remote-tracking branch 'remotes/Elsensee/ticket/10917' into develop-olympus

# By Oliver Schramm
# Via Oliver Schramm
* remotes/Elsensee/ticket/10917:
  [ticket/10917] Using phpbb wrapper
  [ticket/10917] Fixed notice that files are out of date when updating to an unreleased version