Made them idempotent.

Reviewed by:
Submitted by:

include/mpool.h

@@ -33,6 +33,9 @@
  *	@(#)mpool.h	8.1 (Berkeley) 6/2/93
  */
 
+#ifndef _MPOOL_H_
+#define _MPOOL_H_
+
 /*
  * The memory pool scheme is a simple one.  Each in memory page is referenced
  * by a bucket which is threaded in three ways.  All active pages are threaded
@@ -133,3 +136,5 @@ int	 mpool_close __P((MPOOL *));
 void	 mpool_stat __P((MPOOL *));
 #endif
 __END_DECLS
+
+#endif

include/stab.h

@@ -33,6 +33,9 @@
  *	@(#)stab.h	8.1 (Berkeley) 6/2/93
  */
 
+#ifndef _STAB_H_
+#define _STAB_H_
+
 /*
  * The following are symbols used by various debuggers and by the Pascal
  * compiler.  Each of them must have one (or more) of the bits defined by
@@ -65,3 +68,5 @@
 #define	N_ECOMM		0xe4	/* end common */
 #define	N_ECOML		0xe8	/* end common (local name) */
 #define	N_LENG		0xfe	/* length of preceding entry */
+
+#endif