Allow using versions of libnotify < 0.7 in wxGTK.

libnotify 0.4.5 included in Ubuntu Lucid (10.04) can be used for implementing
wxNotificationMessage too, there is only a minor difference with 0.7 API. So
while we stick check for 0.7 initially, accept lower versions too if 0.7 is
not available.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@72456 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/gtk/notifmsg.cpp

@@ -138,6 +138,13 @@ bool wxNotificationMessage::Show(int timeout)
                             GetTitle().utf8_str(),
                             GetMessage().utf8_str(),
                             icon
+#if !wxUSE_LIBNOTIFY_0_7
+                            // There used to be an "associated window"
+                            // parameter in this function but it has
+                            // disappeared by 0.7, so use it for previous
+                            // versions only.
+                            , 0
+#endif // libnotify < 0.7
                          );
         if ( !m_notification )
         {