Remove unnecessary stub destructors

It's a bit misleading to have these stub destructors when they don't do
anything special.

desktop_version/src/Game.cpp

@@ -394,10 +394,6 @@ void Game::init(void)
     disablepause = false;
 }
 
-Game::~Game(void)
-{
-}
-
 void Game::lifesequence()
 {
     if (lifeseq > 0)

desktop_version/src/Game.h

@@ -89,7 +89,6 @@ class Game
 {
 public:
     void init(void);
-    ~Game(void);
 
 
     int crewrescued();

desktop_version/src/Graphics.cpp

@@ -161,11 +161,6 @@ int Graphics::font_idx(uint32_t ch) {
     }
 }
 
-Graphics::~Graphics()
-{
-
-}
-
 void Graphics::drawspritesetcol(int x, int y, int t, int c)
 {
     if (!INBOUNDS(t, sprites))

desktop_version/src/Graphics.h

@@ -23,7 +23,6 @@ class Graphics
 {
 public:
 	void init();
-	~Graphics();
 
 	GraphicsResources grphx;