INT 62 u - FGDRIVER v4.02 - "FG_INVERT" - INVERT ORIENTATION OF BITMAP
	AX = 0064h
	ES:BX -> bitmap
	CX = width of bitmap in bytes
	DX = height of bitmap in pixel rows
Return: nothing
Note:	the FGDRIVER functions are rearranged with each major release, but
	  their parameters do not change (see #03474 at AX=0000h)