[jdk21u-dev] RFR: 8324753: [AIX] adjust os_posix after JDK-8318696

[Matthias Baesken]

8324753: [AIX] adjust os_posix after JDK-8318696

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Commit messages:
 - Backport 8950d68ddb36d35831fbb4b98969cd0537527070

Changes: https://git.openjdk.org/jdk21u-dev/pull/242/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=242&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8324753
  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/242.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/242/head:pull/242

PR: https://git.openjdk.org/jdk21u-dev/pull/242