The path '/var/run' is deprecated, as the following message is being
shown:
/usr/lib/tmpfiles.d/mysql.conf:1: Line references path below legacy
directory /var/run/, updating /var/run/mysqld /run/mysqld;
please update the tmpfiles.d/ drop-in file accordingly.
Closes: https://github.com/gentoo/gentoo/pull/24947
Signed-off-by: Conrad Kostecki <conikost@gentoo.org>