[ticket/11902] Set max execution time to 0 in db update

PHPBB3-11902
[ticket/11902] Prevent errors if set_time_limit disabled

PHPBB3-11902
[ticket/11902] Use phpbb\php\ini class

PHPBB3-11902
Merge remote-tracking branch 'EXreaction/ticket/11902' into develop

* EXreaction/ticket/11902:
  [ticket/11902] Use phpbb\php\ini class
  [ticket/11902] Prevent errors if set_time_limit disabled
  [ticket/11902] Set max execution time to 0 in db update