Implement SetVisited()/GetVisited()

and set the visited state when the link is clicked
(backport of 2fbd2a7800)

include/wx/gtk/hyperlink.h

@@ -19,6 +19,7 @@
 
 class WXDLLIMPEXP_ADV wxHyperlinkCtrl : public wxGenericHyperlinkCtrl
 {
+    typedef wxGenericHyperlinkCtrl base_type;
 public:
     // Default constructor (for two-step construction).
     wxHyperlinkCtrl() { }
@@ -60,6 +61,9 @@ public:
     virtual wxString GetURL() const;
     virtual void SetURL(const wxString &url);
 
+    virtual void SetVisited(bool visited = true);
+    virtual bool GetVisited() const;
+
     virtual void SetLabel(const wxString &label);
 
 protected: