ACPICA commit 49fe4f25483feec2f685b204ef19e28d92979e95

In Haiku, semaphores are represented by integers, not pointers.
So, we can't use NULL as the invalid/destroyed value, the correct value
is -1. Introduce a platform overridable define to allow this.

Fixes #162 (which was closed after coming to the conclusion that this
should be done, but the change was never done).

Link: https://github.com/acpica/acpica/commit/49fe4f25Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>