Updating pngcheck

[Jari Aalto]

On 2021-04-08 19:03, Lemures Lemniscati via Cygwin-apps wrote:
> https://sourceware.org/pipermail/cygwin/2021-March/248073.html
> On Sat, 13 Mar 2021 22:33:27 +0900, Lemures Lemniscati
> > Hi!
> > 
> > Is there any plan to update pngcheck?
> > 
> > Currently, we have pngcheck 2.3.0-1.
> > https://www.cygwin.com/packages/summary/pngcheck-src.html
> > 
> > And, recently, some vulnerabilities have been fixed in its upstream.
> > http://www.libpng.org/pub/png/apps/pngcheck.html
> 
> Hi, Jari Aalto.

Uploaded, thanks for the notice
Jari