ports/176554: science/silo: Update to version 4.9

[edwin at FreeBSD.org]

Synopsis: science/silo: Update to version 4.9

Responsible-Changed-From-To: freebsd-ports-bugs->araujo
Responsible-Changed-By: edwin
Responsible-Changed-When: Thu Feb 28 18:12:46 UTC 2013
Responsible-Changed-Why: 
araujo@ wants this submitter's PRs (via the GNATS Auto Assign Tool)

http://www.freebsd.org/cgi/query-pr.cgi?pr=176554