Log Message:
Update audit-packages to 1.28.

By popular demand, add a -v switch to audit-packages(8) which enables the
check for a package vulnerabilities file being unchanged for over 7 days.
To enable the check, -v must be specified on the command line:

	% audit-packages
	% audit-packages -v
	*** WARNING - /usr/distfiles/pkg-vulnerabilities more than a week old, continuing...
	%