Use Lib, not bin/Lib, for site-packages on MSVC
This matches the subdirectory directory used by pip install --prefix=${CMAKE_INSTALL_PREFIX} vtk
and by setuptools, as specified in _distutils/sysconfig.py for the "nt" platform. A check is done to ensure that capitalization (Lib vs lib) is consistent with CMAKE_INSTALL_LIBDIR
.
Edited by David Gobbi