/usr/lib/x86_64-linux-gnu/apr-util-1/apr_ldap.so is in libaprutil1-ldap 1.5.4-1build1.
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_ldap-1.so
/usr/lib/x86_64-linux-gnu/apr-util-1/apr_ldap-1.so