If we use just G_GNUC_DEPRECATED then it cannot be disabled by
an ifdef.
void gtk_device_grab_remove (GtkWidget *widget,
GdkDevice *device);
void gtk_device_grab_remove (GtkWidget *widget,
GdkDevice *device);
guint gtk_key_snooper_install (GtkKeySnoopFunc snooper,
gpointer func_data);
guint gtk_key_snooper_install (GtkKeySnoopFunc snooper,
gpointer func_data);
void gtk_key_snooper_remove (guint snooper_handler_id);
GdkEvent * gtk_get_current_event (void);
void gtk_key_snooper_remove (guint snooper_handler_id);
GdkEvent * gtk_get_current_event (void);