Add wxABI_VERSION > 20601 wrappers

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@34878 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/msgout.h

@@ -60,6 +60,8 @@ private:
 // otherwise; unlike wxMessageOutputMessageBox this class is always safe to use
 // ----------------------------------------------------------------------------
 
+#if wxABI_VERSION > 20601
+
 class WXDLLIMPEXP_BASE wxMessageOutputBest : public wxMessageOutput
 {
 public:
@@ -68,6 +70,8 @@ public:
     virtual void Printf(const wxChar* format, ...) ATTRIBUTE_PRINTF_2;
 };
 
+#endif // wxABI_VERSION
+
 // ----------------------------------------------------------------------------
 // implementation which sends output to stderr
 // ----------------------------------------------------------------------------