/usr/lib/x86_64-linux-gnu/libpulse-mainloop-glib.so.0 is in libpulse-mainloop-glib0 10.0-1+deb9u1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libpulse-mainloop-glib.so.0.0.5