bug#58823: feature/tree-sitter doesn't build without tree-sitter

[Yuan Fu]

> On Oct 27, 2022, at 10:46 PM, Eli Zaretskii <eliz@gnu.org> wrote:
> 
>> Cc: 58823@debbugs.gnu.org
>> From: Yuan Fu <casouri@gmail.com>
>> Date: Thu, 27 Oct 2022 15:59:14 -0700
>> 
>>> On Oct 27, 2022, at 2:01 PM, Stefan Kangas <stefankangas@gmail.com> wrote:
>>> 
>>> This system does not have tree-sitter installed.  The
>>> feature/tree-sitter branch doesn't seem to build without it.
>> 
>> Oh, right, the lisp code has to prepare for the case where tree-sitter is 
>> not compiled. Should we declare-function for all the functions in treesit.c?
> 
> Yes.
> 
>> And all tree-sitter code called by other lisp files should be guarded by 
>> treesit-available-p. I can fix that.
> 
> Yes, thanks.

Now done.

Yuan