Fix: Don't try to redefine bool on C99 and higher

Author: thrimbor

extract-xiso.c

@@ -369,7 +369,9 @@
 #endif
 
 
-#if ! defined( __cplusplus ) && ! defined( bool )
+#if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L
+#include <stdbool.h>
+#elif ! defined( __cplusplus ) && ! defined( bool )
 	typedef int bool;
 	enum { false, true };
 #endif