fixurjavainstall: Previous Fuji versions can accidentally wipe `/usr/share/man/man8`

Impact Affects: Anyone who generates the UNIX man pages in Fuji = 0.8.0 build with the dev crate feature. Consequences: /usr/share/man/man8 may be entirely removed & re-created without any of the previous entries. Patches At the time of writing, no new version has been released on crates.io, due ...