add Berkeley specific header

add Berkeley specific header

SCCS-vsn: usr.sbin/sendmail/src/READ_ME 4.4
SCCS-vsn: usr.sbin/sendmail/src/alias.c 5.14
SCCS-vsn: usr.sbin/sendmail/src/arpadate.c 5.7
SCCS-vsn: usr.sbin/sendmail/src/clock.c 5.5
SCCS-vsn: usr.sbin/sendmail/src/collect.c 5.3
SCCS-vsn: usr.sbin/sendmail/src/conf.c 5.15
SCCS-vsn: usr.sbin/sendmail/src/conf.h 5.9
SCCS-vsn: usr.sbin/sendmail/src/convtime.c 5.2
SCCS-vsn: usr.sbin/sendmail/src/deliver.c 5.16
SCCS-vsn: usr.sbin/sendmail/src/envelope.c 5.13
SCCS-vsn: usr.sbin/sendmail/src/err.c 5.8
SCCS-vsn: usr.sbin/sendmail/src/headers.c 5.9
SCCS-vsn: usr.sbin/sendmail/src/macro.c 5.4
SCCS-vsn: usr.sbin/sendmail/src/mailstats.h 5.2
SCCS-vsn: usr.sbin/sendmail/src/main.c 5.15
SCCS-vsn: usr.sbin/sendmail/src/parseaddr.c 5.8
SCCS-vsn: usr.sbin/sendmail/src/queue.c 5.23
SCCS-vsn: usr.sbin/sendmail/src/readcf.c 5.11
SCCS-vsn: usr.sbin/sendmail/src/recipient.c 5.11
SCCS-vsn: usr.sbin/sendmail/src/savemail.c 5.8
SCCS-vsn: usr.sbin/sendmail/src/sendmail.h 5.11
SCCS-vsn: usr.sbin/sendmail/src/srvrsmtp.c 5.21
SCCS-vsn: usr.sbin/sendmail/src/stab.c 5.4
SCCS-vsn: usr.sbin/sendmail/src/stats.c 5.9
SCCS-vsn: usr.sbin/sendmail/src/sysexits.c 5.3
SCCS-vsn: usr.sbin/sendmail/src/trace.c 5.4
SCCS-vsn: usr.sbin/sendmail/src/usersmtp.c 5.9
SCCS-vsn: usr.sbin/sendmail/src/util.c 5.11
SCCS-vsn: usr.sbin/sendmail/src/version.c 5.59