[jdk21u] RFR: 8308593: Add KEEPALIVE Extended Socket Options Support for Windows

[Terry Chow]

On Tue, 29 Aug 2023 17:08:31 GMT, Terry Chow <duke at openjdk.org> wrote:

> This is a clean backport of [JDK-8308593](https://bugs.openjdk.org/browse/JDK-8308593), which provides support for the keepalive extended socket options on Windows.
> 
> Tier 1 tests were ran and they're passing along with the existing keepalive tests. I also manually tested and confirmed the patch to be working on Windows (specifically Windows 10 since that's the only Windows platform available to me at the moment).

Hello, JBS issue was tagged with maintainer approval.

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PR Comment: https://git.openjdk.org/jdk21u/pull/117#issuecomment-1712189678