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)
------------- Commit messages: - Add support for AIX dynamic libraries in Class Loader Changes: https://git.openjdk.org/jdk/pull/17945/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=17945&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8319516 Stats: 81 lines in 1 file changed: 81 ins; 0 del; 0 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
