Cocoa Port: Fix a longstanding, yet rare, crash that may occur when quitting the app.

desmume/src/frontend/cocoa/cocoa_GPU.mm

@@ -193,8 +193,6 @@ GPU3DInterface *core3DList[GPU_3D_RENDERER_COUNT+1] = {
 
 - (void)dealloc
 {
-	DestroyOpenGLRenderer();
-	
 	delete fetchObject;
 	delete gpuEvent;
 	

desmume/src/frontend/cocoa/cocoa_core.mm

@@ -226,6 +226,10 @@ volatile bool execute = true;
 	delete execControl;
 	NDS_DeInit();
 	
+	// We must call DestroyOpenGLRenderer() after NDS_Init() because we need to wait for
+	// the OpenGL renderer to finish before we destroy its associated context.
+	DestroyOpenGLRenderer();
+	
 	[super dealloc];
 }