* lib/webrick/server.rb (shutdown): Use close() on @shutdown_pipe_w to
  notify readability on the read side of the pipe.
  write_nonblock() is not usable for pipe on Windows.
  (cleanup_shutdown_pipe): Rescue IOError for @shutdown_pipe_w.close.



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@48354 b2dd03c8-39d4-4d8f-98ff-823fe69b080e