Don't use non-blocking mode unless we have a timeout or use -n.

We only need it if we're using select()/poll() and don't have a
descriptor on which we can block in select()/poll() waiting for packets
to be readable, so that we have to use a timeout and try reading when
the timeout expires; if we can block on the descriptor, that'll let us
know when the read won't block, and if we aren't using select()/poll(),
pcap_dispatch() will wait until packets are available (or the packet
buffer timeout expires).

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