New package: lmdb 0.9.24 - required for knot 3.0.0

New package: lmdb 0.9.24 - required for knot 3.0.0

Lightning Memory-mapped Database from symas.

For details see:
https://symas.com/lmdb/

In contrast to the information from the knot documentation
(see: https://www.knot-dns.cz/docs/3.0/html/requirements.html#required-libraries),
this library is no longer included.

Signed-off-by: Matthias Fischer <matthias.fischer@ipfire.org>
Reviewed-by: Michael Tremer <michael.tremer@ipfire.org>
Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>