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[Tomi Ollila]

This implementation adds add_exit_function (and rm_exit_function)
which can also be used for other things in the future.

Now that I did this simpler way would be to just check for
existence of $GNUPGHOME for indication to exit gpg processes.

If that path is taken this series can be used for future reference
if need for atexit functionality arises.

>From Tomi Ollila <tomi.ollila at iki.fi> # This line is ignored.
From: Tomi Ollila <tomi.ollila at iki.fi>
Subject: stop gpg-agent (among other) processes at test module exit
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