Sdk/State: Make destructor virtual

Former-commit-id: 51b552a0f0282173e73c8613d1924cc1e4105ac1 [formerly 1250f95f374a7b67e47667f4a5dd00f9ae5b1a1f]
Former-commit-id: 85a77a07290da117bfcfbe6ccec7bc85b2c170dc

SDK/include/NDK/State.hpp

@@ -17,7 +17,7 @@ namespace Ndk
 	{
 		public:
 			State() = default;
-			~State() = default;
+			virtual ~State();
 
 			virtual void Enter(StateMachine& fsm) = 0;
 			virtual void Leave(StateMachine& fsm) = 0;

SDK/src/NDK/State.cpp

@@ -0,0 +1,10 @@
+// Copyright (C) 2016 Jérôme Leclercq
+// This file is part of the "Nazara Development Kit"
+// For conditions of distribution and use, see copyright notice in Prerequesites.hpp
+
+#include <NDK/State.hpp>
+
+namespace Ndk
+{
+	State::~State() = default;
+}