Futures flat ahead of growth data

(Reuters) - Stock futures pointed to a flat start for Canada's main stock index on Friday ahead of the release of gross domestic product data for the first quarter. Canada's economic growth is expected to have slowed significantly in the first quarter as the country absorbed the shock of sharply lower oil prices, a major export. Economists expect the economy to have grown at an annualized rate of 0.3 percent, down from the 2.4 percent pace of the fourth quarter. June futures on the S&a