ports/121405: Update graphics/gmt to newer version (4.2.1)

[linimon at FreeBSD.org]

Synopsis: Update graphics/gmt to newer version (4.2.1)

Responsible-Changed-From-To: freebsd-bugs->freebsd-ports-bugs
Responsible-Changed-By: linimon
Responsible-Changed-When: Wed Mar 5 21:09:27 UTC 2008
Responsible-Changed-Why: 
Correct assignment.

http://www.freebsd.org/cgi/query-pr.cgi?pr=121405