INT 21 - DOS 4.x only - SET EXTENDED ATTRIBUTES

	AX = 5704h
	BX = file handle
	ES:DI -> EAV list (see #01670)
Return: CF clear if successful
	CF set on error
	    AX = error code (see #01680)
Note:	the default DOS 4 behavior is to do nothing and return successfully;
	  this functionality was apparently never released to the public
SeeAlso: AX=5702h,AX=5703h,INT 2F/AX=112Dh