[Mutt] #2962: fsync() is not called for messages written to maildir

[Mutt <fleas@xxxxxxxx>]

#2962: fsync() is not called for messages written to maildir

 It can take as much as 30s (or more) till the OS really flushes the
 buffers
 if fsync() is not called.

 Besides, maildir format is not reliable if you do not use fsync.

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Ticket URL: <http://dev.mutt.org/trac/ticket/2962>