RFR: 8304434: [AIX] Update minimum xlclang version

[Tyler Steele]

On Thu, 23 Mar 2023 18:42:41 GMT, Martin Doerr <mdoerr at openjdk.org> wrote:

>> Minor changes to the build system to recognize and warn that an incompatible toolchain is detected.
>
> Yes, I think it's better to define the minimum version to a compiler which will work at the point of time at which we integrate this PR.

Now that JDK-8301998 is merged, we are again build-able on xlclang 16.1.0.0011. Just waiting for one more review @TheRealMDoerr 👀.

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PR Comment: https://git.openjdk.org/jdk/pull/13086#issuecomment-1516952827