[PKG] C++ standard library

libc++_shared.so is constantly a problem. It gets included in every artifact that packages native libraries, which causes collisions all over the place. Ultimately we can exclude it from all of the artifacts, but it needs to be included somewhere. The question is where? If there were an artifact in Maven that included only this library, then each project can specify which version of the C++ library to include, and ultimately Maven will handle it for us. It also gives flexibility for app projects to specify exactly which version to include if different versions are present in the dependency graph.