Add wxUSE_SCROLLBAR guards in wxUniversal

include/wx/univ/scrarrow.h

@@ -11,6 +11,7 @@
 #ifndef _WX_UNIV_SCRARROW_H_
 #define _WX_UNIV_SCRARROW_H_
 
+#if wxUSE_SCROLLBAR
 // ----------------------------------------------------------------------------
 // wxScrollArrows is not a control but just a class containing the common
 // functionality of scroll arrows, whether part of scrollbars, spin ctrls or
@@ -107,5 +108,6 @@ public:
     // false to stop it
     virtual bool OnArrow(wxScrollArrows::Arrow arrow) = 0;
 };
+#endif // wxUSE_SCROLLBAR
 
 #endif // _WX_UNIV_SCRARROW_H_