Only protect the prototypes with #ifndef _ASSERT_H_, the standards

specifically allow changes to the NDEBUG macro between #includes of assert.h

include/assert.h

@@ -39,9 +39,6 @@
  * $FreeBSD$
  */
 
-#ifndef _ASSERT_H_
-#define _ASSERT_H_
-
 #include <sys/cdefs.h>
 
 /*
@@ -62,6 +59,8 @@
 			    __LINE__, #e))
 #endif /* NDEBUG */
 
+#ifndef _ASSERT_H_
+#define _ASSERT_H_
 __BEGIN_DECLS
 void __assert(const char *, const char *, int, const char *);
 __END_DECLS