[Secure-testing-team] Let's remove entries for issues that only manifest in the source package

[Moritz Muehlenhoff]

Hi,
let's remove entries for vulnerabilities that do not manifest in
binary packages from the CAN/list. Filing a bug report for completeness
is fine, but it's beginning to clutter testing-security.html.
Debian is a binary oriented distribution and we don't give security
support for /usr/local either :-)

Any objections?

Cheers,
        Moritz