ports/137921: Port mail/dovecot can't compile with managesieve

[Yarema]

This can be closed.  The following PRs ought to take care of this issue:

http://www.FreeBSD.org/cgi/query-pr.cgi?pr=137935
http://www.FreeBSD.org/cgi/query-pr.cgi?pr=137936
http://www.FreeBSD.org/cgi/query-pr.cgi?pr=137937

-- 
Yarema