bug#67012: 29.1; epa-sign-file pinentry loopback mode does not work with S/MIME

[Ulrich Mueller]

>>>>> On Sat, 25 Nov 2023, Eli Zaretskii wrote:

> OK, thanks.  So please install this on the master branch.

Done. I've also added a short note in doc/misc/epa.texi.

> Should we perhaps have something about this in etc/PROBLEMS?  That is,
> after you install your changes?  If so, feel free to add there
> whatever you think is appropriate.

This ok?

   *** EasyPG loopback pinentry does not work with gpgsm.

   This happens with the 'gpgsm' command from all versions of GnuPG.
   EasyPG relies on the machine-parseable interface that is provided by
   'gpg2' with option '--status-fd', but gpgsm does not support this.

   As a workaround, input the passphrase with a GUI-capable pinentry
   program like 'pinentry-gnome' or 'pinentry-qt5'.  Alternatively, you
   can use the 'pinentry' package from Emacs 25.

Add to etc/PROBLEMS in master or emacs-29 branch?