RFR: 8270875: Deprecate the FilterSpuriousWakeups flag so it can be removed

[David Holmes]

Please review this simple change to deprecate the archaic FilterSpuriousWakeups flag.

See JBS issue for more details.

Testing: manual

Thanks,
David

-------------

Commit messages:
 - 8270875: Deprecate the FilterSpuriousWakeups flag so it can be removed

Changes: https://git.openjdk.java.net/jdk/pull/4821/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=4821&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8270875
  Stats: 3 lines in 2 files changed: 1 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk/pull/4821.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/4821/head:pull/4821

PR: https://git.openjdk.java.net/jdk/pull/4821