/usr/lib/x86_64-linux-gnu/libgnutls-openssl.so is in libgnutls28-dev 3.5.8-5+deb9u4.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libgnutls-openssl.so.27.0.2
/usr/lib/x86_64-linux-gnu/libgnutls-openssl.so.27.0.2