Virus checking options

[Damian]

>> Fedora 38 ships Amavis 2.13.0 which switched to clamdscan in Amavis 
>> upstream.
> We have a winner...   Did the package manager explain/release_note why 
> they made that move?

The config file change [1] comes with an explanation. The Fedora setup 
does not fit the explanation completely, because it runs a dedicated 
clamd instance with amavis uid. Shouldn't be necessary with fdpass, but 
well.

[1] https://gitlab.com/amavis/amavis/merge_requests/38/diffs