Clamav project people offers a new version tarball for package maintainers
few days before the release, i made tests with that tarball, but it was
changed before release, and the distinfo was wrong.
I compared both tarballs and the difference was part of this commit  was
missing on the one i used.
Update distinfo to match 0.97.3 official tarball and bump PORTREVISION
Reported by: many people