[jdk25u] RFR: 8365543: UnixNativeDispatcher.init should lookup open64at and stat64at on AIX

[Matthias Baesken]

8365543: UnixNativeDispatcher.init should lookup open64at and stat64at on AIX

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Commit messages:
 - Backport 166ea12d73c7a40a1a26dc586e3db9d9430c068f

Changes: https://git.openjdk.org/jdk25u/pull/119/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk25u&pr=119&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8365543
  Stats: 16 lines in 2 files changed: 7 ins; 8 del; 1 mod
  Patch: https://git.openjdk.org/jdk25u/pull/119.diff
  Fetch: git fetch https://git.openjdk.org/jdk25u.git pull/119/head:pull/119

PR: https://git.openjdk.org/jdk25u/pull/119