bug#60961: 29.0.60; Compiling emacs-29 without treesitter outputs warnings

[Eli Zaretskii]

> From: Yuan Fu <casouri@gmail.com>
> Date: Fri, 20 Jan 2023 14:11:44 -0800
> Cc: Eli Zaretskii <eliz@gnu.org>,
>  rpluim@gmail.com,
>  60961@debbugs.gnu.org
> 
> I’d prefer c-ts-common.el over treesit.el, since they only apply to C-like 
> languages. There is no harm putting them in a separate file, right? I wrote 
> some commentary in c-ts-mode, which notes all the shared functions and 
> variables. 

c-ts-common.el SGTM, thanks.