MFH: r497122

Fix CVE-2018-5727

• Bump PORTREVISION for possible package change

Obtained from: https://github.com/uclouvain/openjpeg/commit/d6b8aed5612e6be6d3a4053867fbd2ae0cb7c8af
Security: 5efd7a93-2dfb-11e9-9549-e980e869c2e9

Approved by: ports-secteam (joneum)