add wxUSE_TASKBARICON_BALLOONS to make it possible to turn off their usage if our SDK is too old (mainly for VC6 with its original ancient SDK)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@50586 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/msw/taskbar.h

@@ -35,6 +35,7 @@ public:
 
     // MSW-specific class methods
 
+#if wxUSE_TASKBARICON_BALLOONS
     // show a balloon notification (the icon must have been already initialized
     // using SetIcon)
     //
@@ -50,6 +51,7 @@ public:
                      const wxString& text,
                      unsigned msec = 0,
                      int flags = 0);
+#endif // wxUSE_TASKBARICON_BALLOONS
 
 protected:
     friend class wxTaskBarIconWindow;