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box: log the signals handled by libev

Use the `sender_pid` member of `ev_signal` to print out the PID of the
last sender of a signal handled by libev. This allows to track e. g.
the sourse of a `SIGTERM` signal received.

Closes #12477

NO_DOC=logging
NO_CHANGELOG=logging

(cherry picked from commit d364d8c99)

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