Add wxUSE_SCROLLBAR guards in wxUniversal

src/univ/scrarrow.cpp

@@ -33,6 +33,7 @@
 #include "wx/univ/inphand.h"
 #include "wx/univ/theme.h"
 
+#if wxUSE_SCROLLBAR
 // ----------------------------------------------------------------------------
 // wxScrollArrowCaptureData: contains the data used while the arrow is being
 // pressed by the user
@@ -298,3 +299,4 @@ bool wxScrollArrows::HandleMouse(const wxMouseEvent& event) const
 
     return true;
 }
+#endif // wxUSE_SCROLLBAR