RFR: JDK-8319516 AIX System::loadLibrary needs support to load a shared library from an archive object [v18]

[Suchismith Roy]

> Allow support for both .a and .so files in AIX.
> If .so file is not found, allow fallback to .a extension.
> JBS Issue: [JDK-8319516](https://bugs.openjdk.org/browse/JDK-8319516)

Suchismith Roy has updated the pull request incrementally with two additional commits since the last revision:

 - test change
 - test change

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Changes:
  - all: https://git.openjdk.org/jdk/pull/17945/files
  - new: https://git.openjdk.org/jdk/pull/17945/files/f0459fc3..d2f040b1

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=17945&range=17
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=17945&range=16-17

  Stats: 5 lines in 1 file changed: 4 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/17945.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17945/head:pull/17945

PR: https://git.openjdk.org/jdk/pull/17945