[Dovecot] map->hdr.record_size <= tview->record_size

[Edgar Fuß]

This is 1.2.3, but there are also two older dovecots (with different machine 
architecture) sharing the mail store:
dovecot: IMAP(xxx): Panic: file mail-index-transaction-view.c: line 106 
(tview_apply_flag_updates): assertion failed: (map->hdr.record_size <= 
tview->record_size)