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=10h"MultiDOS",AH=1Ch"MultiDOS"