Bug#707750: Info received (Help with mariadb-10.3 cross-building)

[Otto Kekäläinen]

In MariaDB 10.4 and onwards, the server itself (but in 10.5 and
onwards not in ColumnStore) the libreadline has been replaced with
libedit, so this issue can be closed when 10.4 or 10.5 lands in Debian
unstable.