share/zoneinfo: don't build obsolete SystemV zones

The /usr/share/zoneinfo/SystemV directory has been empty on FreeBSD
since 2006.  The upstream source file was removed in 2020.  Also stop
passing yearisdate to zic(8).  This has not been necessary for years.
The script has been removed upstream since 2020.

MFC after:	3 days

ObsoleteFiles.inc

@@ -16424,6 +16424,7 @@ OLD_FILES+=usr/share/zoneinfo/SystemV/EST5
 OLD_FILES+=usr/share/zoneinfo/SystemV/AST4ADT
 OLD_FILES+=usr/share/zoneinfo/SystemV/CST6
 OLD_FILES+=usr/share/zoneinfo/SystemV/AST4
+OLD_DIRS+=usr/share/zoneinfo
 OLD_FILES+=usr/share/doc/ntp/accopt.htm
 OLD_FILES+=usr/share/doc/ntp/assoc.htm
 OLD_FILES+=usr/share/doc/ntp/audio.htm

share/zoneinfo/Makefile

@@ -33,7 +33,6 @@
 .include <src.opts.mk>
 
 PACKAGE=	zoneinfo
-CLEANFILES+=	yearistype
 CLEANDIRS+=	builddir
 CONTRIBDIR=	${SRCTOP}/contrib/tzdata/
 .PATH:		${CONTRIBDIR}
@@ -51,7 +50,7 @@ LEAPFILE=
 
 TZFILES=	africa antarctica asia australasia etcetera europe \
 		factory northamerica southamerica
-TZFILES+=	backward systemv
+TZFILES+=	backward
 POSIXRULES=	America/New_York
 
 TZFILES:=	${TZFILES:S/^/${CONTRIBDIR}/}
@@ -71,8 +70,7 @@ TZBUILDSUBDIRS=	\
 		Etc \
 		Europe \
 		Indian \
-		Pacific \
-		SystemV
+		Pacific
 TZBUILDSUBDIRS+= US Mexico Chile Canada Brazil
 
 .if !defined(_SKIP_BUILD)
@@ -80,12 +78,12 @@ all: zoneinfo
 .endif
 META_TARGETS+=	zoneinfo install-zoneinfo
 
-zoneinfo: yearistype ${TDATA}
+zoneinfo: ${TDATA}
 	mkdir -p ${TZBUILDDIR}
 	cd ${TZBUILDDIR}; mkdir -p ${TZBUILDSUBDIRS}
 	umask 022; cd ${.CURDIR}; \
 	zic -D -d ${TZBUILDDIR} -p ${POSIXRULES} -m ${NOBINMODE} \
-	    ${LEAPFILE} -y ${.OBJDIR}/yearistype ${TZFILES}
+	    ${LEAPFILE} ${TZFILES}
 
 #
 # Sort TZS to ensure they are the same every build. find -s might