Remove obsolete SystemV dir from BSD.usr.dist

/usr/share/zoneinfo/SystemV is removed via ObsoleteFiles as of commits
da038df8c92b and 57338837aef5, so do not create it in the first place.

PR: 266666
Fixes: da038df8c92b ("share/zoneinfo: don't build obsolete...")
MFC after: 3 days