RFR: 8279329: Remove hardcoded IPv4 available policy on Windows

Tue Feb 8 07:49:08 UTC 2022

On Wed, 2 Feb 2022 12:32:13 GMT, Alan Bateman <alanb at openjdk.org> wrote:

>> I added socket connection check same as IPv6_supported().
>> Before this fix, when IPv4 is uninstalled (called `netsh interface ipv4 uninstall`), and set property `-Djava.net.preferIPv4Stack=true`, java.net.InetAddress.PLATFORM_LOOKUP_POLICY.characteristics is always set to 1(IPv4), because IPv4_supported() always returns TRUE. After applied this fix, java.net.InetAddress.PLATFORM_LOOKUP_POLICY.characteristics is set to 2(IPv6). 
>> It looks fine that IPv4_supported() returns FALSE.
>> Would you review this fix?
>
> This looks okay although I assume just one part of the changes need to work in an IPv6-only environment.

@AlanBateman @dfuch @AlekseiEfimov Could someone please commit this PR as a sponsor?

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PR: https://git.openjdk.java.net/jdk/pull/7317