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

[Tyler Steele]

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`.

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Commit messages:
 - Add test logic for df -T local

Changes: https://git.openjdk.org/jdk/pull/13065/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=13065&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8304364
  Stats: 5 lines in 1 file changed: 4 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/13065.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/13065/head:pull/13065

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