Now that makemap(8)/newaliases(8) are merged into smtpctl(8), update

the paths.
Ok gilles@, jung@

src/etc/mailer.conf

@@ -1,9 +1,9 @@
-#	$OpenBSD: mailer.conf,v 1.6 2014/03/27 13:52:45 gilles Exp $
+#	$OpenBSD: mailer.conf,v 1.7 2015/12/07 12:32:06 sunil Exp $
 #
 # Execute the "real" sendmail program, which is now smtpd by default
 #
 sendmail	/usr/sbin/smtpctl
 send-mail	/usr/sbin/smtpctl
 mailq		/usr/sbin/smtpctl
-makemap		/usr/libexec/smtpd/makemap
-newaliases	/usr/libexec/smtpd/makemap
+makemap		/usr/sbin/smtpctl
+newaliases	/usr/sbin/smtpctl