MFH: r438990 r439548

Approved by: ports-secteam (blanket)

irc/irssi-xmpp: Fix build with irssi 1.0

• Add patch from upstream

PR: 217916, 218328
Submitted by: Thibault Jouan <tj+freebsd_ports@a13.fr>
Approved by: maintainer timeout
Obtained from: https://github.com/cdidier/irssi-xmpp/issues/18

irc/irssi-xmpp: Improve regex conformance

PR: 218603
Submitted by: Kyle Evans <bsdports@kyle-evans.net>
Approved by: jadwin (maintainer timeout), rene (mentor)
Differential Revision: https://reviews.freebsd.org/D10524