MFH: r451280 r451633 r452187

www/seamonkey: update to 2.49.1

• linux- version cannot be updated due to lack of gtk3 package

Changes: http://www.seamonkey-project.org/news
PR: 222464
Security: 5e0a038a-ca30-416d-a2f5-38cbf5e7df33
Security: 6cec1b0a-da15-467d-8691-1dea392d4c8d
Security: 555b244e-6b20-4546-851f-d8eb7d6c1ffa
Security: 1098a15b-b0f6-42b7-b5c7-8a8646e8be07
Approved by: ports-secteam (swills)