TSX set to open higher; retail sales data on tap

May 24 (Reuters) - Futures for Canada's main stock index edged higher on Friday, supported by a rise in gold prices, while investors awaited retail sales data due later in the day for more clues on the strength of the Canadian economy. June futures on the S&P/TSX index were up 0.2% at 6:01 a.m. ET (10:01 GMT). On a weekly basis, the benchmark S&P/TSX index looks set for its biggest drop since mid-April. A sell-off in materials stocks due to lower metal prices and expectations of higher-for-longer U.S. interest rates...