RFR: 8304364: [AIX] Build erroneously determines build disk is non-local when using GNU-utils df on AIX

[Erik Joelsson]

On Thu, 16 Mar 2023 18:07:51 GMT, Tyler Steele <tsteele at openjdk.org> wrote:

> The GNU-utils df command supports a flag `-l` which displays information about local disks only. The AIX df equivalent is `-T local`. However, my build systems uses GNU-utils on AIX. In this case, the build system erroneously uses `df -T local`, and incorrectly determines that the disk is non-local from the error text.
> 
> This change corrects that issue by testing if the enabled version of df returns cleanly with the `-T local` flag when AIX is the detected OS. If it does, `-T local` is used, and if not, it defaults to `-l`.

Marked as reviewed by erikj (Reviewer).

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PR: https://git.openjdk.org/jdk/pull/13065