bug#66390: `man' allows to inject arbitrary shell code

[Richard Stallman]

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  > We can do something, just not the way it was suggested: avoid using
  > the shell.

I wonder: do we need to backport this fix to old Emacs versions that we
do not normally maintainn at all, because of the insecurity?

-- 
Dr Richard Stallman (https://stallman.org)
Chief GNUisance of the GNU Project (https://gnu.org)
Founder, Free Software Foundation (https://fsf.org)
Internet Hall-of-Famer (https://internethalloffame.org)