issue #4541: s_globalOrderOfArrival is an static variable of Node class.

cocos/2d/CCNode.cpp

@@ -72,7 +72,7 @@ bool nodeComparisonLess(Node* n1, Node* n2)
 }
 
 // XXX: Yes, nodes might have a sort problem once every 15 days if the game runs at 60 FPS and each frame sprites are reordered.
-static int s_globalOrderOfArrival = 1;
+int Node::s_globalOrderOfArrival = 1;
 
 Node::Node(void)
 : _rotationX(0.0f)

cocos/2d/CCNode.h

@@ -1452,6 +1452,8 @@ protected:
     bool		_cascadeColorEnabled;
     bool        _cascadeOpacityEnabled;
 
+    static int s_globalOrderOfArrival;
+    
 private:
     CC_DISALLOW_COPY_AND_ASSIGN(Node);
 };