/usr/lib/x86_64-linux-gnu/apr-util-1/apr_dbd_mysql.so is in libaprutil1-dbd-mysql 1.5.4-3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/apr-util-1/apr_dbd_mysql-1.so
/usr/lib/x86_64-linux-gnu/apr-util-1/apr_dbd_mysql-1.so