Hook audit into OpenSSH. Now that the necessary bits for OpenSSH support

have been added with the latest OpenBSM import, hook USE_BSM_AUDIT into
build conditionally.

For users which do not care for audit support and do not want to compile
it into their SSH servers, add the following to the /etc/make.conf:

	NO_AUDIT=true

Discussed with:	rwatson
Obtained from:	TrustedBSD Project

secure/usr.sbin/sshd/Makefile

@@ -23,6 +23,12 @@ CFLAGS+=-I${SSHDIR}
 DPADD=	${LIBSSH} ${LIBUTIL} ${LIBZ} ${LIBWRAP} ${LIBPAM}
 LDADD=	-lssh -lutil -lz -lwrap ${MINUSLPAM}
 
+.if !defined(NO_AUDIT)
+CFLAGS+= -DUSE_BSM_AUDIT
+DPADD+=  ${LIBBSM}
+LDADD+=  -lbsm
+.endif
+
 .if !defined(NO_KERBEROS)
 CFLAGS+= -DGSSAPI -DHAVE_GSSAPI_GSSAPI_H=1 -DKRB5 -DHEIMDAL
 DPADD+=	 ${LIBGSSAPI} ${LIBKRB5} ${LIBASN1} ${LIBCOM_ERR} ${LIBROKEN}