added ClamAV version to the X-Virus-Checked header
added ClamAV version to the X-Virus-Checked header

Signed-off-by: Robert <c9484850f6ee3d3fb73f3c3345f26ec064da35e4@pobox.com>

salvis/qpsmtpd,smtpd/qpsmtpd,sieutruc/qpsmtpd,priyadi/qpsmtpd,salvis/qpsmtpd,sieutruc/qpsmtpd,priyadi/qpsmtpd,msimerson/qpsmtpd,msimerson/qpsmtpd,priyadi/qpsmtpd,smtpd/qpsmtpd,sieutruc/qpsmtpd