core: event: libevent: implement _mk_event_update() (#299)
core: event: libevent: implement _mk_event_update() (#299)

Without this, _mk_event_add() would overwrite an existing event object
without freeing it, which leaves an orphaned timer in the event loop.

This issue was causing SSL/TLS to malfunction on Windows. Fix it.

Signed-off-by: Fujimoto Seiji <ef879192bb1e41d519c82cf76440dc8e9a530806@clear-code.com>
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