RFR: 8313141: Missing check for os_thread type in os_windows.cpp

[Julian Waters]

os::os_thread is not handled in os_windows.cpp, and therefore ignores the thread stack size option. I am unsure if this is the right way to handle os::os_thread, please let me know if it is not

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Commit messages:
 - 8313141

Changes: https://git.openjdk.org/jdk/pull/15079/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=15079&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8313141
  Stats: 1 line in 1 file changed: 1 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/15079.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15079/head:pull/15079

PR: https://git.openjdk.org/jdk/pull/15079