Issue #3897: Add missed constructors

cocos/2d/CCComponent.h

@@ -41,7 +41,7 @@ enum {
 
 class CC_DLL Component : public Ref
 {
-protected:
+CC_CONSTRUCTOR_ACCESS:
     /**
      * @js ctor
      */

cocos/2d/CCDrawNode.h

@@ -93,12 +93,13 @@ public:
     
     // Overrides
     virtual void draw(Renderer *renderer, const kmMat4 &transform, bool transformUpdated) override;
-
-protected:
+    
+CC_CONSTRUCTOR_ACCESS:
     DrawNode();
     virtual ~DrawNode();
     virtual bool init();
 
+protected:
     void ensureCapacity(int count);
 
     GLuint      _vao;