fix: fix compilation error

include/RE/B/bhkCharacterController.h

@@ -21,6 +21,7 @@ namespace RE
 	class bhkShape;
 	class bhkWorld;
 	class hkpRigidBody;
+	class hkpWorldObject;
 	class hkContactPoint;
 	class hkTransform;
 	class hkVector4;