hideif.el: support of variadic macros

[路客]

Hi all,

I've just pushed my recent changes for variadic macros support of hideif.el onto the master branch

with commit ID 77ca6aa56e3.

That commit also applies to emacs-28 and emacs-29 branches as well, I wonder if I should cherry-pick

that commit into emacs-28 or emacs-29 accordingly? If yes, which other branches should I also push

as well?

Thanks.

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Best regards,

Luke Lee