(partially) ANSI-fy it

(partially) ANSI-fy it

SCCS-vsn: usr.sbin/sendmail/src/useful.h 4.7
SCCS-vsn: usr.sbin/sendmail/src/headers.c 5.25
SCCS-vsn: usr.sbin/sendmail/src/usersmtp.c 5.24
SCCS-vsn: usr.sbin/sendmail/src/recipient.c 5.37
SCCS-vsn: usr.sbin/sendmail/src/main.c 5.59
SCCS-vsn: usr.sbin/sendmail/src/envelope.c 5.32
SCCS-vsn: usr.sbin/sendmail/src/conf.h 5.28
SCCS-vsn: usr.sbin/sendmail/src/parseaddr.c 5.25
SCCS-vsn: usr.sbin/sendmail/src/err.c 5.15
SCCS-vsn: usr.sbin/sendmail/src/collect.c 5.14
SCCS-vsn: usr.sbin/sendmail/src/version.c 5.123
SCCS-vsn: usr.sbin/sendmail/src/sendmail.h 5.40
SCCS-vsn: usr.sbin/sendmail/src/savemail.c 5.21
SCCS-vsn: usr.sbin/sendmail/src/daemon.c 5.51
SCCS-vsn: usr.sbin/sendmail/src/srvrsmtp.c 5.39
SCCS-vsn: usr.sbin/sendmail/src/clock.c 5.11
SCCS-vsn: usr.sbin/sendmail/src/util.c 5.32
SCCS-vsn: usr.sbin/sendmail/src/readcf.c 5.48
SCCS-vsn: usr.sbin/sendmail/src/deliver.c 5.66
SCCS-vsn: usr.sbin/sendmail/src/queue.c 5.50
SCCS-vsn: usr.sbin/sendmail/src/conf.c 5.43
SCCS-vsn: usr.sbin/sendmail/src/alias.c 5.38
SCCS-vsn: usr.sbin/sendmail/src/udb.c 5.20