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.

But the PASE port in OpenJDK is functional, right? If it was functional, someone may be using it. (I remember talking to IBMers who used OpenJDK on AS/400, but cannot remember if they built it themselves)

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PR Comment: https://git.openjdk.org/jdk/pull/18427#issuecomment-2011818687