To resole hostname to IPv6 addresses gethostbyname2() is needed.

Fix spurious (may be forged) logs when receiving via IPv6 socket,
and fix sending to IPv6-enabled relay.
Bump PKGREVISION
(no revision bump for libmilter, it's not affected)

mail/sendmail/Makefile

@@ -1,7 +1,7 @@
-# $NetBSD: Makefile,v 1.133 2019/07/15 07:05:02 jnemeth Exp $
+# $NetBSD: Makefile,v 1.134 2019/12/03 18:51:02 bouyer Exp $
 
 PKGNAME=	sendmail-${DIST_VERS}
-PKGREVISION=	5
+PKGREVISION=	6
 COMMENT=	The well known Mail Transport Agent
 
 CONFLICTS+=	courier-mta-[0-9]* fastforward>=0.51nb2 postfix-[0-9]*

mail/sendmail/Makefile.common

@@ -1,4 +1,4 @@
-# $NetBSD: Makefile.common,v 1.65 2017/01/19 18:52:17 agc Exp $
+# $NetBSD: Makefile.common,v 1.66 2019/12/03 18:51:02 bouyer Exp $
 #
 # used by mail/libmilter/Makefile
 # used by mail/sendmail/Makefile
@@ -56,6 +56,9 @@ make-sendmail-siteconfig:
       (${OPSYS} != "DragonFly") && (${OPSYS} != "FreeBSD")
 	${CAT} ${FILESDIR}/site.config.m4-v6-not-solaris >>${SITECONFIG}
 .  endif
+.  if ${OPSYS} == "NetBSD"
+	${CAT} ${FILESDIR}/site.config.m4-gethostbyname2 >>${SITECONFIG}
+.  endif
 .endif
 
 	${CAT} ${FILESDIR}/site.config.m4-milter >>${SITECONFIG}

mail/sendmail/files/site.config.m4-gethostbyname2

@@ -0,0 +1,4 @@
+# $NetBSD: site.config.m4-gethostbyname2,v 1.1 2019/12/03 18:51:02 bouyer Exp $
+
+# has gethostbyname2()
+APPENDDEF(`confENVDEF', `-DHAS_GETHOSTBYNAME2')