INT 15 - MultiDOS Plus - RELEASE RESOURCE SEMAPHORE                             
	AH = 02h
	AL = semaphore number (00h-3Fh)
Return: AH = status
	    00h successful
	    01h not semaphore owner
	    02h invalid semaphore number
Notes:	if any tasks are waiting for the semaphore, the first task on the wait
	  queue will become the new owner and be reawakened
	do not use within an interrupt handler
SeeAlso: AH=01h"MultiDOS",AH=10h"MultiDOS",AH=1Ch"MultiDOS"