$NetBSD$

Fix 64-bit build.

--- runtime/debugcom.c~	1997-06-27 09:59:02.000000000 -0400
+++ runtime/debugcom.c	2008-09-04 21:11:39.000000000 -0400
@@ -2,6 +2,8 @@
 
 #include <stdio.h>
 #include <string.h>
+#include <unistd.h>
+#include <arpa/inet.h> /* for inet_addr() */
 #include "misc.h"
 #include "debugger.h"
 #include "mlvalues.h"
