fix dig and nslookup.

sizeof(_res) must be the same for libc, libresolv and libbind.
libc and libresolve uses bind4 while libbind seems to use bind8.

complete fix would be to share the same codebase among libc and libbind,
but I don't know if importing bind8 into libc/libresolv (or bind9 to
all the places) is the right answer.  it involves a big change.

PR: 7966

usr.sbin/bind/include/resolv.h

@@ -1,4 +1,4 @@
-/*	$NetBSD: resolv.h,v 1.2 1999/01/04 00:04:06 tron Exp $	*/
+/*	$NetBSD: resolv.h,v 1.3 1999/08/07 12:40:06 itojun Exp $	*/
 
 /*
  * Copyright (c) 1983, 1987, 1989
@@ -127,7 +127,11 @@ struct __res_state {
 		struct in_addr	addr;
 		u_int32_t	mask;
 	} sort_list[MAXRESOLVSORT];
+#if 0
 	char	pad[72];		/* On an i386 this means 512b total. */
+#else
+	char	lookups[4];
+#endif
 };
 
 /*