[jdk21u] RFR: 8313616: support loading library members on AIX in os::dll_load

[Matthias Baesken]

os_aix.cpp diff in stride

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Commit messages:
 - Backport 23fe2ece586d3ed750e905e1b71a2cd1da91f335

Changes: https://git.openjdk.org/jdk21u/pull/308/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk21u&pr=308&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8313616
  Stats: 22 lines in 3 files changed: 13 ins; 0 del; 9 mod
  Patch: https://git.openjdk.org/jdk21u/pull/308.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u.git pull/308/head:pull/308

PR: https://git.openjdk.org/jdk21u/pull/308