mail/imp3 modifies /usr/local/www/horde/turba/config/conf.php
and horde's registry, and mail/turba couldn't be completely
[Reported by SADA Kenji]
Fix: Remark: this PR bumps PORTREVISION, not for this fix, but for the upgrade
to RC3 (forgotten in previous PR).
Pre-requisite: PR ports/38391 must be committed; then apply this patch:
How-To-Repeat: Install imp3, deinstall it; then deinstall mail/turba and www/horde2.