RFR: JDK-8328604: remove on_aix() function

[Thomas Stuefe]

On Thu, 21 Mar 2024 09:30:08 GMT, Matthias Baesken <mbaesken at openjdk.org> wrote:

> The on_aix() function was added to distinguish "real" AIX and os400 PASE mode. But the os400 PASE was never supported in OpenJDK and there are no plans to do so.
> So we can clean this up a bit and simplify the AIX coding.

Okay then.

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Marked as reviewed by stuefe (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/18427#pullrequestreview-1952024274