GCC 3 conforms to ISO-C-99 so _Bool is a built-in type; we should not try to redefine it.

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@12372 a95241bf-73f2-0310-859d-f6bbb57e9c96

headers/posix/stdbool.h

@@ -8,9 +8,10 @@
 #ifndef __bool_true_false_are_defined
 
 #ifndef __cplusplus
-//typedef enum { false = 0, true = 1 } _Bool;
-	// ToDo: this would change the bool size compared to standard BeOS
+#	if __GNUC__ < 3
+// sizeof(_Bool) == 1 must be true for BeOS compatibility
 typedef unsigned char _Bool;
+#	endif
 #	define bool _Bool
 #	define true 1
 #	define false 0