ports/180702: graphics/gmt: Update to version 4.5.9

[edwin at FreeBSD.org]

Synopsis: graphics/gmt: Update to version 4.5.9

Responsible-Changed-From-To: freebsd-ports-bugs->miwi
Responsible-Changed-By: edwin
Responsible-Changed-When: Sat Jul 20 18:12:38 UTC 2013
Responsible-Changed-Why: 
miwi@ wants this submitter's PRs (via the GNATS Auto Assign Tool)

http://www.freebsd.org/cgi/query-pr.cgi?pr=180702