document mbox locking method
|Assignee:||Hiroyuki Yamamoto||% Done:|
This has been notified recently in the mailing list (http://www.sraoss.jp/pipermail/sylpheed/2014-April/006009.html), and now filed as Debian bug #746389
Since this is a upstream issue affecting all distros I'm forwarding it here.
A configure flag to allow selection of the mbox locking method would be even better than documenting it :-)