warnings (and some errors) fixes for wxUniv DLL build

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@22541 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/univ/ctrlrend.cpp

@@ -545,7 +545,7 @@ void wxControlRenderer::DrawBitmap(wxDC &dc,
 }
 
 void wxControlRenderer::DrawScrollbar(const wxScrollBar *scrollbar,
-                                      int thumbPosOld)
+                                      int WXUNUSED(thumbPosOld))
 {
     // we will only redraw the parts which must be redrawn and not everything
     wxRegion rgnUpdate = scrollbar->GetUpdateRegion();