Windows doesn't support selectable pcap fds, so instead of fiddling with
adapter read timeouts via PacketSetReadTimeout, we get an event handle
with pcap_get_event and WaitForSIngleObject. This means we don't need to
extract the adapter from the pcap_t, which is not part of the libpcap
API and was causing crashes switching between the libpcap versions used
by WinPcap and Npcap.