Fix build error 'SDL_main': must return a value and link error Error LNK2019 unresolved external symbol _SDL_main referenced in function _main_utf8 on Windows in Visual Studio 2017
Fix build error 'SDL_main': must return a value and link error Error LNK2019 unresolved external symbol _SDL_main referenced in function _main_utf8 on Windows in Visual Studio 2017

antonte/tetris