removed all compile- and run-time checks for GTK+ < 2.4; don't include the generic files which are now never used in wxGTK in the build

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@49660 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/generic/buttonbar.cpp

@@ -493,7 +493,7 @@ void wxButtonToolBar::OnCommand(wxCommandEvent& event)
 }
 
 // paints a border
-void wxButtonToolBar::OnPaint(wxPaintEvent& event)
+void wxButtonToolBar::OnPaint(wxPaintEvent& WXUNUSED(event))
 {
     wxPaintDC dc(this);