[emacs-w3m:13455] unnecessary/unused hook?

Variable w3m-select-buffer-mode-hook is never explictly defined (compare
to defcustom w3m-select-buffer-hook) but is referenced. The only time a
value is assigned to it seems to be for xemacs.

Should it be explicitly defined? Should it be removed as cruft from when
the project was supporting xemacs?

8< ------------------------------------------------------------------ >8
w3m.el:11386:  (w3m-run-mode-hooks 'w3m-select-buffer-mode-hook))
w3m-xmas.el:768:  (add-hook 'w3m-select-buffer-mode-hook 'w3m-setup-tab-in-gutter)
8< ------------------------------------------------------------------ >8

This was all coded very long (12-14 years) ago:

8< ------------------------------------------------------------------ >8
$ git blame  -L 11386,+1 -- w3m.el

  8933820da (Katsumi Yamaoka 2005-05-30 06:47:23 +0000 11386)

$ git blame  -L 768,+1 -- w3m-xmas.el

  11faaaaa1 (Katsumi Yamaoka 2007-01-30 11:00:52 +0000 768)
8< ------------------------------------------------------------------ >8

Also, the hook is being run using function w3m-run-mode-hooks instead of
just run-mode-hooks, but is that ever necessary in any recent version of
emac-sen?

8< ------------------------------------------------------------------ >8
w3m.el9098:  (w3m-run-mode-hooks 'w3m-mode-hook))
w3m.el11386:  (w3m-run-mode-hooks 'w3m-select-buffer-mode-hook))
w3m-form.el1703:  (w3m-run-mode-hooks 'w3m-form-input-select-mode-hook))
w3m-form.el1873:  (w3m-run-mode-hooks 'w3m-form-input-map-mode-hook))
w3m-util.el1377:(defun w3m-run-mode-hooks (&rest funcs)
8< ------------------------------------------------------------------ >8

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