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

[Chris Hegarty]

Arthur,

> On 11 May 2019, at 11:48, Chris Hegarty <chris.hegarty at oracle.com> wrote:
> 
> Arthur,
> 
>> On 10 May 2019, at 17:37, Arthur Eubanks <aeubanks at google.com <mailto:aeubanks at google.com>> wrote:
>> 
>> Sounds good.
>> New webrev: http://cr.openjdk.java.net/~aeubanks/8223532/webrev.03/ <http://cr.openjdk.java.net/~aeubanks/8223532/webrev.03/>
>> 
>> This is almost exactly the changes we made internally to this file.
> 
> Good that we eventually converged on the same substantive solution.
> Bad that we went in a little circle first ( though it does give an 
> additional level of confidence that we ended up in a similar place).
> 
> I think that this latest webrev looks good. I’ll do some testing with
> it and report back the results.

All good. I see no issues when running various tests.

-Chris.

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