$NetBSD$

Add standard includes needed for LP64 build.

--- lib/errmsg.c~	1998-08-20 09:56:11.000000000 -0400
+++ lib/errmsg.c	2009-11-29 19:01:05.000000000 -0500
@@ -1,3 +1,6 @@
+#include <stdio.h>
+#include <stdlib.h>
+
 #define PRIVATE static
 
 /*--------------------------------------------------------------------*/
