fixed compilation after wxTipWindow base class change, added wxUSE_TIPWINDOW

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@12786 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/generic/tipwin.cpp

@@ -33,6 +33,9 @@
 #endif // WX_PRECOMP
 
 #include "wx/tipwin.h"
+
+#if wxUSE_TIPWINDOW
+
 #include "wx/timer.h"
 #include "wx/settings.h"
 
@@ -205,4 +208,5 @@ void wxTipWindow::Close()
     Destroy();
 }
 
+#endif // wxUSE_TIPWINDOW