/usr/lib/x86_64-linux-gnu/libapr_memcache.so is in libapr-memcache-dev 0.7.0-3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libapr_memcache.so.0.0.1
/usr/lib/x86_64-linux-gnu/libapr_memcache.so.0.0.1