/usr/share/jetty/lib/ext/libsetuid.so is in libjetty-extra 6.1.26-5.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/jetty/lib/ext/../../../../lib/jetty/libsetuid.so
/usr/share/jetty/lib/ext/../../../../lib/jetty/libsetuid.so