[ipv6] Re: [RFR]: 8222562: IPv6 only systems fail on setsockopt(IPV6_V6ONLY, 0)

[Arthur Eubanks]

>
> I believe that `DONT_ENABLE_IPV4`is not strictly required. Maybe just
> drop it?  Is it an initial attempt to support an IPv6-only JDK build?
> If so, then maybe we separate out that requirement.
>
It was in the IPv6 code right below so I just copied it in case we wanted
an IPv6-only build at some point. But yes that can be in a separate change.
Removed.
New webrev:
http://cr.openjdk.java.net/~aeubanks/ipv6setsockopt/webrev.02/index.html
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