Linking fix: g_isIdle is for GTK1 only.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@46504 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/unix/mediactrl.cpp

@@ -145,8 +145,10 @@
 #      define DEBUG_MAIN_THREAD
 #   endif // Debug
 
+#ifndef __WXGTK20__
 extern void wxapp_install_idle_handler();
 extern bool g_isIdle;
+#endif
 extern bool g_mainThreadLocked;
 #endif // wxGTK
 
@@ -323,8 +325,10 @@ static gint gtk_window_realize_callback(GtkWidget* theWidget,
 {
     DEBUG_MAIN_THREAD // TODO: Is this neccessary?
 
+#ifndef __WXGTK20__
     if (g_isIdle)   // FIXME: Why is needed? For wxYield? ??
         wxapp_install_idle_handler();
+#endif
 
     wxYield();    // FIXME: RN: X Server gets an error/crash if I don't do
                   //       this or a messagebox beforehand?!?!??