Bug#945051: [debian-mysql] Bug#945051: galera-3: incompatible with fs.protected_regular = 1

[Alexander E. Patrakov]

Control: reassign -1 mariadb-server-10.3 1:10.3.18-0+deb10u1
Control: forwarded -1 https://jira.mariadb.org/browse/MDEV-21140

Also created a pull request upstream:
https://github.com/MariaDB/server/pull/1417