security/f-prot no longer receives signature updates

[Benjamin Lutz]

Hello,

I just noticed that F-Prot 4.6.8 is no longer supported by the manufacturer, 
so signature updates no longer work. The last valid signatures are dated 
2008-10-20, now the update site only responds with:

  5
  Support for this version of F-PROT has been discontinued. Please upgrade
  to use F-PROT version 6. More information: www.f-prot.com or
  support at f-prot.com

Because of this, please update the port to F-Prot 6 or delete it; a virus 
scanner with outdated signatures is more dangerous than no virus scanner at 
all.

Presumably the same applies to security/f-protd, so I've cc'd its 
maintainer. Also, amavisd-new references f-prot in its configuration, so 
this ought to be updated as well.

Cheers
Benjamin