bug#73557: c-ts-mode 'emacs-c broken with treesit-load-name-override-list

[Ship Mints <shipmints@gmail.com>]

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The c-ts-mode "fake" emacs-c grammar does not work in the presence of a 'c
grammar provided in treesit-load-name-override-list.

For example, I set this override to point to my treesitter c grammar which
uses the file name "c.dylib" on Mac, not "tree_sitter_c.dylib":

(add-to-list 'treesit-load-name-override-list '(c "c" "tree_sitter_c"))

c-ts-mode says:
(define-derived-mode c-ts-mode c-ts-base-mode "C"
...
    (setf (alist-get 'emacs-c treesit-load-name-override-list)
          '("libtree-sitter-c" "tree_sitter_c"))

I think this code should first look for the 'c grammar in
'treesit-load-name-override-list before setting a hard-coded file name that
may not work for everyone.

I can get around this, temporarily, by setting a symlink from c.dylib to
libtree-sitter-c.dylib. It took a while to figure out what was going on,
though. This is surely going to confuse other people.

Thank you,

Stephane

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