Timeout events not handled correctly in `mini-event`?

Testing for release 4.10.1 on a FreeBSD machine without libevent installed caused `ixfr_badformat.tdir` and `ixfr_superlong.tdir` to fail. Installing libevent-devel, rerunning `configure` followed by `make` and the tests ran just fine. Meaning, there's something off with handling of timeouts in `mini-event`, we should look into that.