Merge pull request #269 from kwatts/render_callback_virtual_dtor

Render callback virtual dtor

btgui/Bullet3AppSupport/CommonParameterInterface.h

@@ -33,6 +33,7 @@ struct SliderParams
 
 struct CommonParameterInterface
 {
+	virtual ~CommonParameterInterface() {}
 	virtual void registerSliderFloatParameter(SliderParams& params)=0;
 	virtual void syncParameters()=0;
 	virtual void removeAllParameters()=0;

btgui/Bullet3AppSupport/CommonPhysicsSetup.h

@@ -15,6 +15,7 @@ class btDiscreteDynamicsWorld;
 ///The GraphicsPhysicsBridge let's the graphics engine create graphics representation and synchronize
 struct GraphicsPhysicsBridge
 {
+	virtual ~GraphicsPhysicsBridge() {}
 
 	virtual void createRigidBodyGraphicsObject(btRigidBody* body,const btVector3& color)
 	{