SDLPP: add .dll target for windows

sdlpp/sdlpp_collision.hpp

@@ -5,7 +5,7 @@
 #include "sdlpp_renderer.hpp"
 
 namespace SDLPP {
-class CollisionPolygon {
+class SDLPPSCOPE CollisionPolygon {
 public:
     CollisionPolygon( double x, double y );
     virtual ~CollisionPolygon() {}
@@ -36,9 +36,9 @@ protected:
     SDL_Color sdl_outline = { 0, 0, 0, 0 };
 };
 
-bool infinityIntersection( const SDLPP::CollisionPolygon &infinite,
+SDLPPSCOPE bool infinityIntersection( const SDLPP::CollisionPolygon &infinite,
                            const SDLPP::CollisionPolygon &other );
-bool intersects( const SDLPP::CollisionPolygon &p1,
+SDLPPSCOPE bool intersects( const SDLPP::CollisionPolygon &p1,
                  const SDLPP::CollisionPolygon &p2 );
 } // namespace SDLPP
 #endif