thread.c: enable ppoll for FreeBSD 11.0 and later

FreeBSD 11.0+ supports ppoll, so we may use it after accounting
for portability differences in how it treats POLLOUT vs POLLHUP
events as mutually exclusive (as documented in the FreeBSD
poll(2) manpage).

For waiting on high-numbered single FDs, this should put
FreeBSD on equal footing with Linux and should allow cheaper
FD readiness checking with sleepy GC in the future.

* thread.c (USE_POLL, POLLERR_SET): define for FreeBSD 11.0+
  (rb_wait_for_single_fd): return all requested events on POLLERR_SET
  io.c (USE_POLL): define for FreeBSD 11.0+

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@63427 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

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