/usr/lib/x86_64-linux-gnu/libxcb-randr.so is in libxcb-randr0-dev 1.10-3+b1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libxcb-randr.so.0.1.0
/usr/lib/x86_64-linux-gnu/libxcb-randr.so.0.1.0