I do not know whether ndiswrapper truly needs these GPL symbols; let us assume that it does.USB support cannot be implemented without them. The message is quite misleading, by the way:
Symbol usb_register_driver is being used by a non-GPL module, which will not be allowed in the future
Copyright © 2017, Eklektix, Inc.
Comments and public postings are copyrighted by their creators.
Linux is a registered trademark of Linus Torvalds