RFR: Add support for AIX in build process [v5]

[Suchismith Roy]

> Summary of the issues: 
> 
> 1. There is no support for compiling AIX dynamic .a library and the tool was compiling .so files instead. 
> 2. There is no logic to support libclang.a. 
> 3.  There is no support to load shared member of .a dynamic libraries of AIX. 
> 
> JBS Issue: [CODETOOLS-7904116](https://bugs.openjdk.org/browse/CODETOOLS-7904116)

Suchismith Roy has refreshed the contents of this pull request, and previous commits have been removed. The incremental views will show differences compared to the previous content of the PR. The pull request contains three new commits since the last revision:

 - change library lookup path:
 - Indendtation
 - Restore changes in Build files

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Changes:
  - all: https://git.openjdk.org/jextract/pull/297/files
  - new: https://git.openjdk.org/jextract/pull/297/files/b3df01c2..92967cdd

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jextract&pr=297&range=04
 - incr: https://webrevs.openjdk.org/?repo=jextract&pr=297&range=03-04

  Stats: 0 lines in 0 files changed: 0 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jextract/pull/297.diff
  Fetch: git fetch https://git.openjdk.org/jextract.git pull/297/head:pull/297

PR: https://git.openjdk.org/jextract/pull/297