We no longer need to refer to m4/cf.m4 specifically

Makefile

@@ -52,7 +52,7 @@ all: sendmail-config mail-aliases sendmail-default sm-client-service sendmail-se
 	@echo "$$MAIL_ALIASES" > /etc/mail/aliases
 	newaliases
 	install -v -Dm644 sendmail.mc /etc/mail
-	cd /etc/mail && m4 m4/cf.m4 sendmail.mc > sendmail.cf
+	cd /etc/mail && m4 sendmail.mc > sendmail.cf
 	@echo "$$SENDMAIL_DEFAULT" > /etc/default/sendmail
 	@echo "$$SM_CLIENT_SERVICE" > /lib/systemd/system/sm-client.service
 	systemctl enable sm-client.service