Ruby » Ruby master

merge revision(s) 63ab7046a1a5c374a52dfa79406fe52d92d80344:

    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