use poll rather than select in dns lookups (also clock_gettime)

if the file descriptor resource limit has been increased past
FD_SETSIZE, this is actually a security issue; we could write past the
end of the fd_set object. using poll makes it a non-issue, and
simplifies the code at the same time.

also, use clock_gettime instead of gettimeofday, for reduced bloat
and better entropy.

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