MDEV-12469: static_assert cannot be determined on bigendian
MDEV-12469: static_assert cannot be determined on bigendian

Signed-off-by: Daniel Black <ce6aa2808e3fe4e77f6f1aff6fb988c295097d35@au.ibm.com>

natsys/mariadb_10.2,natsys/mariadb_10.2,natsys/mariadb_10.2,natsys/mariadb_10.2,natsys/mariadb_10.2,natsys/mariadb_10.2,natsys/mariadb_10.2,natsys/mariadb_10.2,natsys/mariadb_10.2,natsys/mariadb_10.2,natsys/mariadb_10.2