INT 62 u - FGDRIVER v4.02 - "FG_TCDEFINE" - DEFINE TRANSPARENCY OF COLOR INDEX
	AX = 00C4h
	BX = color index
	CX = transparency (00h opaque, other transparent)
Notes:	the FGDRIVER functions are rearranged with each major release, but
	  their parameters do not change (see #03474 at AX=0000h)
	This function is ignored in text modes
SeeAlso: AX=00C5h,AX=00C6h