ports/144549: Update graphics/pngcrush to 1.7.9

[miwi at FreeBSD.org]

Synopsis: Update graphics/pngcrush to 1.7.9

Responsible-Changed-From-To: freebsd-ports-bugs->miwi
Responsible-Changed-By: miwi
Responsible-Changed-When: Mon Mar 8 17:01:38 UTC 2010
Responsible-Changed-Why: 
I'll take it.

http://www.freebsd.org/cgi/query-pr.cgi?pr=144549