Add bundling manually listed libraries

[Majdoddin]

Would be nice to give a list of libs to be bundled, in addition to thos detected automatically.

It's a useful feature for this:

Code that dynamically loads libraries at runtime using ctypes / cffi (from Python) or dlopen (from C/C++) doesn't contain this information in a way that can be statically determined, so dependencies that are loaded via those mechanisms will be missed.

[mayeut]

auditwheel wouldn't know how to mangle this, probably skip mangling in this case which might not be a good idea depending on the libraries being copied.
This would require passing not only the libraries being copied but also where to put them, they can't be copied to a place where they would be able to be automagically dlopened by filename only (would require a full path or some code allowing them to be found).
I feel it would be better handled when packaging the wheel, at least the top-level plugins can be copied where they should at that stage. auditwheel would then handle their dependencies automatically with proper mangling.