bug#22442: 25.0.50; --with-cairo does not display PNG on GNU/Linux

[Eli Zaretskii]

> From: Paul Eggert <eggert@cs.ucla.edu>
> Date: Sat, 23 Jan 2016 00:27:08 -0800
> 
> To reproduce the problem, configure Emacs --with-cairo, and then run these 
> shell 
> commands:
> 
> wget https://upload.wikimedia.org/wikipedia/commons/f/f5/All_palaeotemps.png
> emacs -Q All_palaeotemps.png
> 
> Emacs shows a blank (or sometimes garbled) screen instead of the image.

Due to this and other issues with Cairo, and the lack of an active
developer who could work on fixing them, should we perhaps say in NEWS
that --with-cairo is still experimental?

Thanks.