if the driver attemping to load is not zink and not software, then attempt a zink fallback on failure
this conservatively handles the case of "only zink is built", though it is going to be noticeably slower at startup than loading zink directly
if the driver attemping to load is not zink and not software, then attempt a zink fallback on failure
this conservatively handles the case of "only zink is built", though it is going to be noticeably slower at startup than loading zink directly