The libusb_wrap_sys_device function can wrap an opened fd from the
system into a libusb handler. However, in FreeBSD's libusb implementation, a
USB device contains two fds: one for control transfers and another for
normal (bulk, interrupt, isochronous) transfers.

This design makes it impossible for FreeBSD to implement this function
without exposing a different structure in libusb.h to provide two fds.
Therefore, we return LIBUSB_ERROR_NOT_SUPPORTED to maintain API
compatibility.

Sponsored By: The FreeBSD Foundation.