Support configuration option --with-jni-libpath?

[keithc-ca]

Summary of problem

OpenJDK introduced the configuration option --with-jni-libpath in Java 12, which affects the definition of HOTSPOT_OVERRIDE_LIBPATH, ultimately altering the default value of java.library.path. As the name suggests, this is specific to HotSpot, but ibmruntimes/openj9-openjdk-jdk21#386 wonders if OpenJ9 might support that option.

[keithc-ca]

The upstream change is ibmruntimes/openj9-openjdk-jdk12@a621897.

[mbaudier]

This would be especially useful when packaging for a given Linux distribution. It has been a few years that we are building and packaging OpenJ9 internally as full-fledged deb packages for Debian stable. As we use JNI more and more, it would be nice if it could integrate seamlessly with packaged JNI libraries, just like the official HotSpot-based openjdk- packages.