Return non-const pointer from wxDataViewRendererBase::GetView().

Non-const wxWindow pointers are unfortunately needed quite often in wx API so
return a non-const pointer here to allow using it with e.g. wxRendererNative
(whose methods all take non-const wxWindow pointers) in the derived classes.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@68852 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/dvrenderers.h

@@ -173,8 +173,9 @@ protected:
     wxWeakRef<wxWindow>     m_editorCtrl;
     wxDataViewItem          m_item; // for m_editorCtrl
 
-    // internal utility:
-    const wxDataViewCtrl* GetView() const;
+    // internal utility, may be used anywhere the window associated with the
+    // renderer is required
+    wxDataViewCtrl* GetView() const;
 
 protected:
     DECLARE_DYNAMIC_CLASS_NO_COPY(wxDataViewRendererBase)