bug#30670: 26.0.91; PNG files on Windows

[Eli Zaretskii]

> From: kensanata@gmail.com
> Date: Thu, 01 Mar 2018 20:23:50 +0100
> 
> I can view JPG files but not PNG files on Windows and I don't know why.
> I see that it's a configured feature in the output below but apparently
> the right DLL is not included because 
> 
> (image-type-available-p 'jpeg) => t
> (image-type-available-p 'png) => nil
> 
> This is what my bin directory contains:
> 
> c:/Portable Programs/emacs-26.0.91-x86_64/bin $ ls lib* | grep "png"
> libpng-config
> libpng16-16.dll
> libpng16-config

Where did you get those PNG DLLs?