RFR: 8304434: [AIX] Update minimum xlclang version [v2]

[Matthias Baesken]

On Tue, 4 Apr 2023 01:49:09 GMT, Tyler Steele <tsteele at openjdk.org> wrote:

>> Minor changes to the build system to recognize and warn that an incompatible toolchain is detected.
>
> Tyler Steele has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Change min xlx FP level to 11

btw when replacing xlC with xlclang in the script snippet above , the behavior is the same.

And there might be one more issue in the version checks on AIX; the bash version check shows me
`sed: Function s/^.*bash.*ersion *([0-9.]*).*$/\1/ p cannot be parsed.`
in the build log so this looks not good as well.

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PR Comment: https://git.openjdk.org/jdk/pull/13086#issuecomment-1517379294