[ipv6] RFR: 8223532: Don't try creating IPv4 sockets in NetworkInterface.c if IPv4 is not supported

[Arthur Eubanks]

>
> Hi Arthur,
>
> This is not hotspot - I don't think you do :-)
>
> But FWIW this last webrev looks good to me too.
>
> best regards,
>
> -- daniel
>
> I thought I always needed two people to say the change looks good. Is only
needing one reviewer a JDK policy or a net-dev policy?
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