It is not present in BeOS R5 and it just call unload_driver_settings.
Replace delete_driver_settings usages with unload_driver_settings.
Keep the symbol on x86 for binary compatibility.
Change-Id: I1382710e3a4cb5c65d1249ea0e5880891e6800e4
Reviewed-on: https://review.haiku-os.org/c/haiku/+/3485
Reviewed-by: Jérôme Duval <jerome.duval@gmail.com>