bug#33452: Color of tooltip text on macOS with dark mode

[Eli Zaretskii]

> Date: Fri, 23 Nov 2018 20:38:51 +0000
> From: Alan Third <alan@idiocy.org>
> Cc: tkk@misasa.okayama-u.ac.jp, 33452@debbugs.gnu.org
> 
> Sorry, I thought you were meaning colours as set by Emacs lisp.
> 
> We can set the foreground and background to anything we want in C, but
> in emacs-26 currently we can’t modify them by Emacs lisp, and only the
> background colour is being set in C, which leaves the foreground to
> use whatever the system default is.
> 
> The master branch honours the colours set by lisp.

Thanks.  So what are out alternatives for emacs-26, besides
backporting from master (which will give control on colors to Lisp)?