do not keep hoststat and purgestat, they are pointing to the sendmail

executable and will not serve any purpose with smtpd by default
ok jmc@ tedu@

src/etc/mailer.conf

@@ -1,4 +1,4 @@
-#	$OpenBSD: mailer.conf,v 1.5 2014/03/12 18:21:34 tedu Exp $
+#	$OpenBSD: mailer.conf,v 1.6 2014/03/27 13:52:45 gilles Exp $
 #
 # Execute the "real" sendmail program, which is now smtpd by default
 #
@@ -7,5 +7,3 @@ send-mail	/usr/sbin/smtpctl
 mailq		/usr/sbin/smtpctl
 makemap		/usr/libexec/smtpd/makemap
 newaliases	/usr/libexec/smtpd/makemap
-hoststat	/usr/libexec/sendmail/sendmail
-purgestat	/usr/libexec/sendmail/sendmail