bug#60888: 29.0.60; Lost c-or-c++-ts-mode

[Juri Linkov]

I started to rely on c-or-c++-ts-mode because there is no other replacement
to use for such mappings in init files:

  (when (and (treesit-ready-p 'c t) (treesit-ready-p 'cpp t))
    (add-to-list 'major-mode-remap-alist '(c-or-c++-mode . c-or-c++-ts-mode)))

c-or-c++-mode is activated for all .h files, so there should be the 
corresponding
c-or-c++-ts-mode, but it's lost somewhere in emacs-29.