mbox: flock() and lockf() now use blocking alarm()ed locking.
mbox: flock() and lockf() now use blocking alarm()ed locking.

LTD-Beget/dovecot,LTD-Beget/dovecot,LTD-Beget/dovecot,LTD-Beget/dovecot,LTD-Beget/dovecot