[jdk21u-dev] RFR: 8328604: remove on_aix() function

[Matthias Baesken]

8328604: remove on_aix() function

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Commit messages:
 - Backport 940d1965f831a9f7e4f1ce34e381c038827c7ca2

Changes: https://git.openjdk.org/jdk21u-dev/pull/449/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=449&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8328604
  Stats: 39 lines in 2 files changed: 0 ins; 30 del; 9 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/449.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/449/head:pull/449

PR: https://git.openjdk.org/jdk21u-dev/pull/449