configure (and there's not much point, as openssh won't work without it)
so HAVE_SELECT is not defined and the poll(2) compat code doesn't get
built in. Remove HAVE_SELECT so we can build on platforms without poll.
openbsd-compat/bsd-poll.{c,h} openbsd-compat/openbsd-compat.h]
Add an implementation of poll() built on top of select(2). Code from
OpenNTPD with changes suggested by djm. ok djm@