changed wxWindow::ApplyToolTip to take UTF8-encoded char* instead of wxChar* to avoid unnecessary conversions

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@46248 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/gtk/tooltip.h

@@ -50,7 +50,7 @@ public:
     // this just sets the given tooltip for the specified widget
     //
     // tip must be already UTF-8 encoded
-    static void Apply(GtkWidget *w, const wxCharBuffer& tip);
+    static void Apply(GtkWidget *w, const gchar *tip);
 
 private:
     wxString     m_text;