opensmtpd-extras: drop in favor of standalone tables

Upstream has archived the OpenSMTPD-extras repository with 82c49af (add
deprecation notice, 2024-10-22). Instead, it has created a set of
repositories, each containing one of the tables. The old tables aren't
compatible anymore with recent OpenSMTPD versions due to changed
protocols. Other extras, like the queues, don't have an alternative to
the best of my knowledge.

Furthermore, opensmtpd-extras doesn't even build anymore, furthermore
indicating that there aren't any users of this package. Remove the
"opensmtpd-extras" package and raise errors pointing to the new
standalone tables.

Add a release note.

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