change ai_addrlen to socklen_t. now it conforms to

draft-ietf-ipngwg-rfc2553bis-03.txt.  backward compatibility concern:
- should be safe to change signed to unsigned, as we never return
negative value.
- sizeof(int) is 4 for all archs, so there's no size change with socklen_t
(= u_int32_t)
commented by deraadt.

src/include/netdb.h

@@ -1,4 +1,4 @@
-/*	$OpenBSD: netdb.h,v 1.11 2000/10/04 22:54:23 espie Exp $	*/
+/*	$OpenBSD: netdb.h,v 1.12 2001/02/21 15:12:00 itojun Exp $	*/
 
 /*
  * ++Copyright++ 1980, 1983, 1988, 1993
@@ -179,7 +179,7 @@ struct addrinfo {
 	int ai_family;		/* protocol family for socket */
 	int ai_socktype;	/* socket type */
 	int ai_protocol;	/* protocol for socket */
-	int ai_addrlen;		/* length of socket-address */
+	socklen_t ai_addrlen;	/* length of socket-address */
 	struct sockaddr *ai_addr; /* socket-address for socket */
 	char *ai_canonname;	/* canonical name for service location (iff req) */
 	struct addrinfo *ai_next; /* pointer to next in list */