INT 2F - MS Windows "WINOLDAP" - GET CLIPBOARD DATA SIZE
	AX = 1704h
	DX = clipboard format supported by WinOldAp (see #02723)
Return: DX:AX = size of data in bytes, including any headers
		0000h:0000h if no data in this format in the Clipboard
Note:	Windows reportedly rounds up the size of the data to a multiple of 32
	  bytes
SeeAlso: AX=1700h,AX=1703h,AX=1705h