Ensure `cuda_static`'s directory is passed to `setuptools`

[leofang]

Follow-up of #517. We need to inform setuptools to pass -L so that cudart_static can show up in the compiler search paths without extra hacks. The logic should eventually get library_dirs updated:

cuda-python/cuda_bindings/setup.py

Line 285 in bd770e1

library_dirs=library_dirs,