[Dovecot] 1.0.rc24 released

And more fixes.

* Dovecot now fails to load plugins that were compiled for different
  Dovecot version, unless version_ignore=yes is set. This needs to be
  explicitly set in plugins, so out-of-tree plugins won't have this
  check by default.

- pop3_lock_session=yes could cause deadlocks, and with maildir the
  uidlist lock could have been overridden after 2 minutes causing
  problems
- PAM wasted CPU by calling a timeout function 1000x too often
- Trash plugin was more or less broken with multiple namespaces and
  with multiple trash mailboxes