INT 15 - DESQview v2.23+ - "PUTCOMMON" - DEALLOCATE "COMMON" MEMORY
	AX = DE1Ah
	ES:DI -> previously allocated block
Return: AX = 0000h (successful)
Note:	this function may be called from within a hardware interrupt handler
SeeAlso: AX=DE0Dh,AX=DE19h