INT 21 - FlashTek X-32VM - SET SELECTOR LIMIT

	AX = 3505h
	BX = selector
	ECX = desired limit
Return: CF clear if successful
	    ECX = actual limit set
	CF set on error (no more selectors available)
Note:	the limit will be rounded down to nearest 4K boundary if the requested
	  limit is greater than 1MB
SeeAlso: AX=3503h,INT 31/AX=0008h