Make sure config.h or the copy of that gets included only once to reduce duplicate include

warnings.

lib/paranoia/overlap.c

@@ -1,7 +1,5 @@
 /*
-  $Id: overlap.c,v 1.6 2008/04/17 17:39:48 karl Exp $
-
-  Copyright (C) 2004, 2005, 2008 Rocky Bernstein <rocky@gnu.org>
+  Copyright (C) 2004, 2005, 2008, 2011 Rocky Bernstein <rocky@gnu.org>
   Copyright (C) 1998 Monty xiphmont@mit.edu
   
   This program is free software: you can redistribute it and/or modify
@@ -25,7 +23,8 @@
  ***/
 
 #ifdef HAVE_CONFIG_H
-#include "config.h"
+# include "config.h"
+# define __CDIO_CONFIG_H__ 1
 #endif
 
 #ifdef HAVE_STDLIB_H