bug#59415: 29.0.50; [feature/tree-sitter] c-ts-mode fails to fontify a portion of a large C file

[Eli Zaretskii]

> From: Yuan Fu <casouri@gmail.com>
> Date: Sun, 20 Nov 2022 17:27:16 -0800
> Cc: Eli Zaretskii <eliz@gnu.org>,
>  59415@debbugs.gnu.org
> 
> Also I think we should probably disable fontifying errors in C. C’s macros 
> just create too much errors.

Let's make it optional.  I think at least I would like to see those errors.

Thanks.