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wait.c: poll over nread

• ext/io/wait/wait.c (io_ready_p, io_wait_readable): try polling
  first and check FIONREAD optionally to see if EOF.
  [ruby-core:36805] [Feature #4849]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@50262 b2dd03c8-39d4-4d8f-98ff-823fe69b080e