bug#43058: 27.1; Support for other colour font formats

[Eli Zaretskii]

> From: Peter Oliver <lists.gnu.org@mavit.org.uk>
> Date: Wed, 26 Aug 2020 13:24:05 +0100
> 
> The NEWS file for Emacs 27.1 says:
> “Multicolor fonts such as "Noto Color Emoji" can be displayed on
> Emacs configured with Cairo drawing and linked with cairo >= 1.16.0.”
> I would submit a patch to change this to mention that only CBDT is currently 
> supported, but I’m not sure if that’s true on, e.g., Windows or MacOS.

AFAIK, we support whatever Cairo supports, so stating the limitation
in our NEWS would be unwise, I think, because Cairo is also being
developed, and so such statements could become inaccurate outside of
our control.