[jdk16u] RFR: 8265666: Enable AIX build platform to make external debug symbols

[Christoph Langer]

8265666: Enable AIX build platform to make external debug symbols

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Commit messages:
 - Backport 84b52db931943db5aa2df7edca7103776f2f2092

Changes: https://git.openjdk.java.net/jdk16u/pull/113/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk16u&pr=113&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8265666
  Stats: 18 lines in 2 files changed: 7 ins; 9 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk16u/pull/113.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk16u pull/113/head:pull/113

PR: https://git.openjdk.java.net/jdk16u/pull/113