ports/180503: science/gromacs: Update to version 4.6.3

[edwin at FreeBSD.org]

Synopsis: science/gromacs: Update to version 4.6.3

Responsible-Changed-From-To: freebsd-ports-bugs->miwi
Responsible-Changed-By: edwin
Responsible-Changed-When: Fri Jul 12 18:10:23 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=180503