removed the weird m_style which was never initialized GTK and duplicated m_windowStyle under Mac/MSW

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@24179 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/mac/checkbox.cpp

@@ -34,8 +34,6 @@ bool wxCheckBox::Create(wxWindow *parent, wxWindowID id, const wxString& label,
     if ( !wxCheckBoxBase::Create(parent, id, pos, size, style, validator, name) )
         return false;
 
-    m_style = style;
-
     Rect bounds ;
     Str255 title ;