A major sync of upstream pacakging accidentally included some lines that
were ancient and should not have been imported on 10.5 in Debian:
https://salsa.debian.org/mariadb-team/mariadb-10.5/-/commit/2039c2755d0c642718dcc8be852174205577542b

Upstream packaging seems to have introduced this line 9 years ago:
https://github.com/MariaDB/server/commit/cfd4fcb0bc3d469dfca74dae30d17250d65fdd91#diff-733e7d6cfbf529c0530e7b06c97071e2c7dafa6d8b673495fecdce3f1d57015bR139

These lines are now also being removed upstream in:
https://github.com/MariaDB/server/pull/1825