[Dovecot] Dovecot can't find CLucene's libstemmer on FreeBSD

[interfaSys sàrl]

Hello,

A set of patches was created by Lawrence Chen for the Dovecot2 port so
that it could recognise and use libstemmer and libexttextcat.

They can't be used as is as he's replacing statements with something
that works only on FreeBSD, but I think it would be a good idea to try
and include some of his fixes.

http://www.freebsd.org/cgi/query-pr.cgi?pr=ports/175813

Cheers,

Olivier