RFR: 8304434: [AIX] Update minimum xlclang version

[Martin Doerr]

On Fri, 17 Mar 2023 22:36:24 GMT, Tyler Steele <tsteele 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.

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PR Comment: https://git.openjdk.org/jdk/pull/13086#issuecomment-1481716972