* dtable.cc (dtable::set_file_pointers_for_exec): Call SetFilePointer

	* dtable.cc (dtable::set_file_pointers_for_exec): Call SetFilePointer
	correctly for 64 bit file access.  Comment out functionality.
	* fhandler.cc (fhandler_base::open): Don't set append_mode.
	(fhandler_base::write): Check for O_APPEND instead of append_mode.
	Call SetFilePointer correctly for 64 bit file access.  Handle
	errors from SetFilePointer.
	* fhandler.h (class fhandler_base): Drop append_mode status flag.
	* fhandler_disk_file.cc (fhandler_base::fstat_helper): Handle
	seeking correctly for 64 bit file access.