RFR: JDK-8324753: [AIX] adjust os_posix after JDK-8318696

Fri Jan 26 13:33:50 UTC 2024

[JDK-8318696](https://bugs.openjdk.org/browse/JDK-8318696) changed not only Linux related os coding, but also os_posix.
Unfortunately, this touches AIX as well, we use there now the non-large-file functions (e.g. lseek) which could be problematic.
See also https://www.ibm.com/docs/en/aix/7.1?topic=volumes-writing-programs-that-access-large-files .

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Commit messages:
 - JDK-8324753

Changes: https://git.openjdk.org/jdk/pull/17587/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=17587&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8324753
  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/17587.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17587/head:pull/17587

PR: https://git.openjdk.org/jdk/pull/17587