Read the 'maxssf' parameter if defined in Authen::SASL #2
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If /perl-authen-sasl/perl-authen-sasl/pull/11 is accepted, this adds support for reading the new 'maxssf' parameter.
Authen::SASL::XS is required for Active Directory domains using 'LDAP server channel binding token requirements' set to 'Always' (current security recommendation), because Authen::SASL::Perl does not appear to support CBT but Cyrus SASL does. But the XS module also requires MAXSSF set to 0, which is hard-coded to 255 with no mechanism to change it.
Leaving the default at 255 even through the Perl module defaults to 2**31 - 1