US STOCKS-Wall St Posts Modest Gains as Jobs Report Keeps Fed Hikes on Track
* Unemployment drops to 3.6% vs estimate of 3.7%* Nonfarm payrolls rose by 431,000 jobs last month* GameStop seeks share split* Dow up 0.4%, S&P 500 up 0.3%, Nasdaq up 0.3%(Reuters) - The S&P 500 rose