ports/112728: update ports/graphics/png to 1.2.17

[Eygene Ryabinkin]

Thu, May 17, 2007 at 07:00:11AM +0000, FreeBSD-gnats-submit at FreeBSD.org wrote:
> Thank you very much for your problem report.
> It has the internal identification `ports/112728'.
> The individual assigned to look at your
> report is: freebsd-ports-bugs. 
> 
> You can access the state of your problem report at any time
> via this link:
> 
> http://www.freebsd.org/cgi/query-pr.cgi?pr=112728

Seems like this PR is outdated by ports/112725. Moving the
discuission there.

This PR can be safely closed, sorry for the noise.
-- 
Eygene