updates for DoGetBestSize

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@4639 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/os2/spinbutt.h

@@ -49,7 +49,7 @@ public:
                           ,int maxVal
                          );
 
-    // Implementation    
+    // Implementation
     virtual bool OS2Command( WXUINT param
                             ,WXWORD id
                            );
@@ -64,7 +64,7 @@ public:
                             );
 
 protected:
-   virtual wxSize DoGetBestSize();
+   virtual wxSize DoGetBestSize() const;
 private:
     DECLARE_DYNAMIC_CLASS(wxSpinButton)
 };