RFR: 8270929: Obsolete the FilterSpuriousWakeups flag in JDK 19

[David Holmes]

On Fri, 17 Dec 2021 14:47:57 GMT, Harold Seigel <hseigel at openjdk.org> wrote:

>> Please review this small change to obsolete the `FilterSpuriousWakeups` flag that was deprecated in JDK 18.
>> 
>> There are no associated doc changes, nor test changes.
>> 
>> Testing: tier1-5 builds (in progress)
>> 
>> Thanks,
>> David
>
> Changes look good and trivial.
> Thanks, Harold

Thanks @hseigel ! It is a simple change but not quite trivial per the guidelines, so I'll wait for a second review.

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PR: https://git.openjdk.java.net/jdk/pull/6871