--------O-217142-------------------------------
INT 21 - EDR-DOS 7.01.08+ - "Long LSEEK" - SET CURRENT 64-bit FILE POSITION
	AX = 7142h
	CL = origin of move
	    00h start of file
	    01h current file position
	    02h end of file
	BX = file handle
	DS:DX = pointer to (signed) 64-bit offset from origin of new position
Return: CF clear if successful
	    DS:DX unchanged, new 64-bit position from start of file at -> DS:DX
	CF set on error
	    AX = error code (01h,06h) (see #01680 at AH=59h/BX=0000h)
