RFR: 8339019: Obsolete the UseLinuxPosixThreadCPUClocks flag

[David Holmes]

The UseLinuxPosixThreadCPUClocks flag was deprecated in 24 and should be obsoleted in 25. 

Testing: tiers 1-3 sanity

Thanks

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Commit messages:
 - 8339019: Obsolete the UseLinuxPosixThreadCPUClocks flag

Changes: https://git.openjdk.org/jdk/pull/22595/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=22595&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8339019
  Stats: 6 lines in 2 files changed: 0 ins; 6 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/22595.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/22595/head:pull/22595

PR: https://git.openjdk.org/jdk/pull/22595