Platform: don't allow SDL2 to redefine main().

src/Platform/Sdl2Application.h

@@ -22,6 +22,9 @@
 #include "Math/Vector2.h"
 #include "Magnum.h"
 
+#ifdef _WIN32 /* Windows version of SDL2 redefines main(), we don't want that */
+#define SDL_MAIN_HANDLED
+#endif
 #include <SDL2/SDL.h>
 #include <SDL2/SDL_scancode.h>
 #include <Corrade/Containers/EnumSet.h>