r343009:
Add four kerberos CLI utilities to OptionalObsoleteFiles.inc
Add asn1_compile, make-roken, kcc, and slc to the OptionalObsoleteFiles.inc
so they would be removed during delete-old stage if the new world is built
without Kerberos support.
r343109:
Add optional obsolete files for the installworld without sendmail
Add two more entries for WITHOUT_SENDMAIL install. The /var/spool/clientmqueue
entry would be deleted only if there are no files/dirs in it, so the
content generated during previous lifecycle of the system is safe
r343110:
Fix conditional obsolete files entry for WITHOUT_EXAMPLES
Add all the files under /usr/share/examples to the MK_EXAMPLES
section. OLD_DIRS entries are not removed if they're not empty so
prior to this change WITHOUT_EXAMPLES didn't have significant effect
on the updated system.