Bug 23995: Remove CHECK constraints from kohastructure
MySQL8 and MariaDB10.3 impliment check constraints but utilise
different, incompatible, syntaxes to do so.
This patch removes the check constraints entirely whilst we work on a
better solution to work around the incompatabilities of the two DBs.
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com> Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org> Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>