/usr/lib/x86_64-linux-gnu/libXrandr.so is in libxrandr-dev 2:1.4.2-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libXrandr.so.2.2.0
/usr/lib/x86_64-linux-gnu/libXrandr.so.2.2.0