Include spares MTA option

Miscellaneous mapping table MTA options:  (bitmask)
Replaced in 8.0.2.2 by the  MTA option.

See also:
 * Access mapping table MTA options
 * ldap_spare_1 MTA Option
 * ldap_spare_2 MTA Option
 * ldap_spare_3 MTA Option
 * ldap_spare_4 MTA Option
 * ldap_spare_5 MTA Option
 * ldap_spare_6 MTA Option
 * include_conversiontag MTA Option
 * Recipient access mapping tables
 * FROM_ACCESS mapping table
 * include_spares1 MTA Option
 * include_spares2 MTA Option