prepare-package phase copies native libraries under classes/lib for the packaged native libraries if native-lib-loader is a dependency.

This is my suggestion for packaging all the native libraries. When they are generated from multiple platforms, we can package them in one jar at the final stage.
Add native-lib-loader case in [narSystemPackage] in configuration.apt

Loading multiple native libraries are supported with help of native-lib-loader.
The short description is added in [narSystemPackage] section.