Remove Serializable's virtual destructor. It didn't do anything anyway.

To still make the compiler happy, add virtual destructors
to all descendants of Serializable.

src/etc.h

@@ -48,6 +48,8 @@ struct Color : public Serializable
 	Color(const Vec4 &norm);
 	Color(const Color &o);
 
+	virtual ~Color() {}
+
 	bool operator==(const Color &o) const;
 
 	void updateInternal();
@@ -95,6 +97,8 @@ struct Tone : public Serializable
 	Tone(double red, double green, double blue, double gray = 0);
 	Tone(const Tone &o);
 
+	virtual ~Tone() {}
+
 	bool operator==(const Tone &o) const;
 
 	void updateInternal();
@@ -140,6 +144,8 @@ struct Rect : public Serializable
 	    : x(0), y(0), width(0), height(0)
 	{}
 
+	virtual ~Rect() {}
+
 	Rect(int x, int y, int width, int height);
 	Rect(const Rect &o);
 	Rect(const IntRect &r);

src/serializable.h

@@ -24,8 +24,6 @@
 
 struct Serializable
 {
-	virtual ~Serializable() {}
-
 	virtual int serialSize() const = 0;
 	virtual void serialize(char *buffer) const = 0;
 };

src/table.h

@@ -31,7 +31,7 @@ class Table : public Serializable
 {
 public:
 	Table(int x, int y = 1, int z = 1);
-	~Table();
+	virtual ~Table();
 
 	int xSize() const { return m_x; }
 	int ySize() const { return m_y; }