fix UNLOZE+ReservedSlots

fix dependency unload error in a few plugins with LibraryExists in OnAllPluginsLoaded

AdvancedTargeting/scripting/AdvancedTargeting.sp

@@ -105,6 +105,9 @@ public void OnAllPluginsLoaded()
 		(g_Extension_Voice ? "loaded" : "not loaded"));
 }
 
+public void OnLibraryAdded(const char[] name) { OnAllPluginsLoaded(); }
+public void OnLibraryRemoved(const char[] name) { OnAllPluginsLoaded(); }
+
 public Action Command_Admins(int client, int args)
 {
 	char aBuf[1024];