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/html/helpctrl.cpp

@@ -195,7 +195,7 @@ bool wxHtmlHelpController::DisplaySection(int sectionNo)
 
 bool wxHtmlHelpController::DisplayTextPopup(const wxString& text, const wxPoint& WXUNUSED(pos))
 {
-#if wxUSE_HELP
+#if wxUSE_TIPWINDOW
     static wxTipWindow* s_tipWindow = NULL;
 
     if (s_tipWindow)
@@ -213,7 +213,8 @@ bool wxHtmlHelpController::DisplayTextPopup(const wxString& text, const wxPoint&
 
         return TRUE;
     }
-#endif
+#endif // wxUSE_TIPWINDOW
+
     return FALSE;
 }