AIX build was failed by JDK-8261169 against jdk11u-dev.
To fix this issue, C++ compiler should migrate from XL C++ 13.1.3 to XL C++ 16.1.
Also we need to switch from xlC-based to clang-based compiler.

I want to request some backports (which are not related Harfbuzz) against AIX platform.
For short-term solution, I'd like to keep Harfbuzz 2.3.1 just for AIX platform only.

* Copy Harfbuzz 2.3.1 to src/java.desktop/aix/native/libharfbuzz
* Modify make/lib/Awt2dLibraries.gmk

By there changes, we can use xlC-based XL C++ 13.1.3 and 16.1.

So please backout this change before migrating to clang-based 16.1.