[3.14] gh-83424: Allow empty name if handle is non-null when create ctypes.CDLL on Windows (GH-136878) (#138546)

gh-83424: Allow empty name if handle is non-null when create ctypes.CDLL on Windows (GH-136878)
(cherry picked from commit ed522ed211b7b9ea9d85a93b5d6ca79b2df3ef58)

Co-authored-by: AN Long <aisk@users.noreply.github.com>
Co-authored-by: Petr Viktorin <encukou@gmail.com>