bug#20702: 25.0.50; (elisp) `ImageMagick Images': say how to tell if Emacs has IM support, etc.

[Glenn Morris]

Eli Zaretskii wrote:

>      C-h v system-configuration-features RET
>
> are better ways of getting at that information.  The latter should IMO
> be documented in both manuals.

As NEWS says, s-c-f is mainly (entirely) intended for Emacs bug reports.
I don't think that checking for elements in there is the right way to
see if Emacs supports a given feature. That's why it is intentionally
not mentioned in the manuals.