NEW YORK — TCI Intl., the overseas investment arm of cable giant Tele-Communications Inc., lost $29 million in the fourth quarter of 1996 compared with a profit of $95 million a year earlier.The earnings turnaround mainly reflected a big one-time profit of $165 million in 1995 on sale of stock in Telewest, the Brit telephone and cable operator partly owned by TCI Intl. TCI Intl. said its earnings were also hurt by higher costs at its U.K. programming subsidiary Flextech Plc. For the year TCI Intl. lost $130 million, compared with a profit of $30 million in 1995.