Is it possible to use run-hooks in those Emacs versions?
Yes, but it won't always be correct.
Maybe Gnus can do something like:
(or (fboundp 'run-mode-hooks)
(defalias 'run-mode-hooks 'run-hooks))
Definitely not! Gnus should not mess with the way Emacs defines
(or doesn't define) these functions!
Gnus should define a function called gnus-run-mode-hooks, which calls
run-mode-hooks if that is defined, otherwise run-hooks. Then all the
modes in Gnus could use gnus-run-mode-hooks.
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