do not build unused code and remove uneeded dependency on libm.

ok tb@

usr.sbin/smtpd/smtpd.h

@@ -1,4 +1,4 @@
-/*	$OpenBSD: smtpd.h,v 1.666 2021/04/10 06:44:18 eric Exp $	*/
+/*	$OpenBSD: smtpd.h,v 1.667 2021/04/11 07:18:08 eric Exp $	*/
 
 /*
  * Copyright (c) 2008 Gilles Chehade <[email protected]>
@@ -1638,11 +1638,6 @@ const char *srs_encode(const char *, const char *);
 const char *srs_decode(const char *);
 
 
-/* ssl_smtpd.c */
-void   *ssl_mta_init(void *, char *, off_t, const char *);
-void   *ssl_smtp_init(void *, int);
-
-
 /* stat_backend.c */
 struct stat_backend	*stat_backend_lookup(const char *);
 void	stat_increment(const char *, size_t);

usr.sbin/smtpd/smtpd/Makefile

@@ -1,4 +1,4 @@
-#	$OpenBSD: Makefile,v 1.111 2021/03/05 12:37:32 eric Exp $
+#	$OpenBSD: Makefile,v 1.112 2021/04/11 07:18:08 eric Exp $
 
 .PATH:		${.CURDIR}/..
 
@@ -51,8 +51,6 @@ SRCS+=	smtp_session.c
 SRCS+=	smtpd.c
 SRCS+=	srs.c
 SRCS+=	ssl.c
-SRCS+=	ssl_smtpd.c
-SRCS+=	ssl_verify.c
 SRCS+=	stat_backend.c
 SRCS+=	table.c
 SRCS+=	to.c
@@ -82,8 +80,8 @@ SRCS+=		stat_ramstat.c
 MAN=		sendmail.8 smtpd.8 smtpd.conf.5 table.5
 BINDIR=		/usr/sbin
 
-LDADD+=		-levent -lutil -ltls -lssl -lcrypto -lm -lz
-DPADD+=		${LIBEVENT} ${LIBUTIL} ${LIBTLS} ${LIBSSL} ${LIBCRYPTO} ${LIBM} ${LIBZ}
+LDADD+=		-levent -lutil -ltls -lssl -lcrypto -lz
+DPADD+=		${LIBEVENT} ${LIBUTIL} ${LIBTLS} ${LIBSSL} ${LIBCRYPTO} ${LIBZ}
 
 CFLAGS+=	-fstack-protector-all
 CFLAGS+=	-I${.CURDIR}/..

usr.sbin/smtpd/ssl.h

@@ -1,4 +1,4 @@
-/*	$OpenBSD: ssl.h,v 1.22 2021/03/05 12:37:32 eric Exp $	*/
+/*	$OpenBSD: ssl.h,v 1.23 2021/04/11 07:18:08 eric Exp $	*/
 /*
  * Copyright (c) 2013 Gilles Chehade <[email protected]>
  *
@@ -65,9 +65,3 @@ int		ssl_load_pkey(const void *, size_t, char *, off_t,
 int		ssl_ctx_fake_private_key(SSL_CTX *, const void *, size_t,
 		    char *, off_t, X509 **, EVP_PKEY **);
 char *ssl_pubkey_hash(const char *, off_t);
-
-/* ssl_privsep.c */
-int		ssl_by_mem_ctrl(X509_LOOKUP *, int, const char *, long, char **);
-
-/* ssl_verify.c */
-int ssl_check_name(X509 *, const char *, int *);