graphics/openjpeg: Fix CVE-2017-14041
The port had 5 CVEs reported in
vuxml entry < http://www.vuxml.org/freebsd/11dc3890-0e64-11e8-99b0-d017c2987f9a.html >.
These patches are fix for CVE-2017-1404

Reported by: Philip Jocks <pj@netzkommune.de>
Approved by: sunpoet (maintainer)
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D16685