ACPICA: Differentiate Windows 8.1 from Windows 8.

ACPICA commit 66db7b38f61e63f11e48a0ea993d92b12e0a17ca

Link: https://github.com/acpica/acpica/commit/66db7b38


Signed-off-by: Jung-uk Kim <jkim@free_BSD.org>
Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Erik Schmauss <erik.schmauss@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>