Implement wxRadioButton Get/SetLabel methods.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@47941 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/cocoa/radiobut.h

@@ -64,6 +64,8 @@ private:
 public:
     virtual void SetValue(bool);
     virtual bool GetValue() const;
+    virtual void SetLabel(const wxString& label);
+    virtual wxString GetLabel() const;
 protected:
     wxRadioButtonList m_radioSlaves;
     wxRadioButton *m_radioMaster;