Add some missing runtime gtk+ version checks. There is more to spot.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@34647 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/gtk/toplevel.cpp

@@ -683,7 +683,7 @@ bool wxTopLevelWindowGTK::ShowFullScreen(bool show, long style )
     //     to switch to fullscreen, which is not always available. We must
     //     check if WM supports the spec and use legacy methods if it
     //     doesn't.
-    if (method == wxX11_FS_WMSPEC)
+    if ( (method == wxX11_FS_WMSPEC) && !gtk_check_version(2,2,0) )
     {
         if (show)
             gtk_window_fullscreen( GTK_WINDOW( m_widget ) );