bug#74339: 30.0.92; CC Mode stomps C TS Mode

[Eli Zaretskii <eliz@gnu.org>]

> Cc: monnier@iro.umontreal.ca, 74339@debbugs.gnu.org
> Date: Thu, 14 Nov 2024 21:23:41 +0200
> From: Eli Zaretskii <eliz@gnu.org>
> 
> I prefer to make a simpler and more localized change, which only
> manipulates major-mode-remap-defaults.  I would not like to risk
> changes like modifying auto-mode-alist, which might have other
> unintended consequences, at least on the release branch.  Let's stay
> with major-mode-remap-defaults, since we already understand well
> enough what the code does, and need just to tweak it in minor ways.

I've now made changes in c-ts-mode.el on the emacs-30 branch that
allow to remap CC Mode's C/C++ modes to the corresponding tree-sitter
based modes as result of loading c-ts-mode, which resolves this bug.
(cc-mode.el remains unchanged, so loading cc-mode will revert to using
CC Mode, as it did before this change.  IOW, the changes I installed
make it possible for users to prefer c-ts-mode if they want, and leave
intact the ability of users to prefer cc-mode if that is what they
want.)

With that, I'm closing this bug.

Dmitry, please consider a similar change in ruby-mode.el and
ruby-ts-mode.el, since what we have there now is that once
ruby-ts-mode is loaded, there's no way for users to go back to using
ruby-mode unless they customize major-mode-remap-alist.