RFR: JDK-8306672: support offset in dll_address_to_library_name on AIX

[JoKern65]

So far the offset return reference parameter was not supported on AIX, but always set to -1. This could be improved, it was already supported on other OS platforms like Linux.

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Commit messages:
 - JDK-8306672

Changes: https://git.openjdk.org/jdk/pull/13692/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=13692&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8306672
  Stats: 36 lines in 3 files changed: 35 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/13692.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/13692/head:pull/13692

PR: https://git.openjdk.org/jdk/pull/13692