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merge revision(s) 45084: [Backport #9547]

    * ext/socket/init.c (wait_connectable): break if the socket is
      writable to avoid infinite loops on FreeBSD and other platforms
      which conforms to SUSv3.  This problem cannot be reproduced with
      loopback interfaces, so it's hard to write test code.
      rsock_connect() and wait_connectable() are overly complicated, so
      they should be refactored, but I commit this fix as a workaround
      for the release of Ruby 1.9.3 scheduled on Feb 24.
      [ruby-core:60940] [Bug #9547]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_1@45129 b2dd03c8-39d4-4d8f-98ff-823fe69b080e