Shellfu v0.10.48 - FloatingPointError
Overview of changes:
* Added missing util-linux dependency (Fedora 35 containers)
Since Fedora 35, Fedora containers won't come with util-linux.
This breaks shellfu because it also means there's no 'rev' command,
which is used during initialization.
* Avoided non-standard 'which' dependency in test header
* Minor packaging meta-data cleanup