MFH: r424771

irc/quasssel: Patch CMakeLists.txt to fix build against SSL with Qt 5.6

PR:		213581
Submitted by:	Christian Schwarz (me@cschwarz.com)
Submitted by:	tcberner
Reviewed by:	mat
Approved by:	adamw (mentor, implicit)
Obtained from:	https://github.com/quassel/quassel/commit/4768c9e99f99b581d4e32e797db91d0182391696
Differential Revision:	https://reviews.freebsd.org/D8294

Approved by:	ports-secteam (feld)
Approved by:	adamw (mentor, implicit)