make more Init() functions private

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@72604 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/gtk/dvrenderers.h

@@ -142,10 +142,9 @@ public:
 
     virtual GtkCellRendererText *GtkGetTextRenderer() const;
 
-protected:
+private:
     bool Init(wxDataViewCellMode mode, int align);
 
-private:
     // Called from GtkGetTextRenderer() to really create the renderer if
     // necessary.
     void GtkInitTextRenderer();