support multiline labels in wxCheckBox (#9495)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@54008 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/msw/checkbox.h

@@ -42,6 +42,8 @@ public:
     virtual bool GetValue() const;
 
     // override some base class virtuals
+    virtual void SetLabel(const wxString& label);
+
     virtual bool MSWCommand(WXUINT param, WXWORD id);
     virtual void Command(wxCommandEvent& event);
     virtual bool SetForegroundColour(const wxColour& colour);