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Skip POINTOPOINT of IPv4 too instead of IPv6 only Fix following error on `utun*`: ``` 1) Error: TestSocket#test_udp_server: Errno::ECONNREFUSED: Connection refused - recvmsg(2) ``` git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_6@67825 b2dd03c8-39d4-4d8f-98ff-823fe69b080e