Log Message:
Update to Dovecot 1.1.19.

- file_set_size() was broken with OSes that didn't support posix_fallocate()
  (almost everyone except Linux), causing all kinds of index file errors.
- ldap: Fixed hang when >128 requests were sent at once.
- Fixed a crash in saving messages where message contained a CR character that
  wasn't followed by LF (and the CR happened to be the last character in an
  internal buffer).
- deliver: Don't send rejects to any messages that have Auto-Submitted header.
  This avoids emails loops.
- Message decoding fixes (mainly for IMAP SEARCH, Sieve).