[jdk17u] RFR: 8272114: Unused _last_state in osThread_windows

[Alex Kasko]

Clean backport of the Windows-specific cleanup.

Additional testing:

 -[x] tier1 on Windows

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Commit messages:
 - Backport 11cddd3261e2bfaa4f2b9142ce9e275bbc48c72e

Changes: https://git.openjdk.java.net/jdk17u/pull/205/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk17u&pr=205&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8272114
  Stats: 7 lines in 1 file changed: 0 ins; 7 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk17u/pull/205.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk17u pull/205/head:pull/205

PR: https://git.openjdk.java.net/jdk17u/pull/205