Ports that use this are
 - marked BROKEN unless ALLOW_DELIBERATE_VULNERABILITIES is defined.
 - given a package prefix name of "vulnerable-".
 - have a large warning displayed when installed.

This meta-port can be used to collect requirements for demos.  It
includes two flavors, the default for harmless stuff like tools and
trival demos and a vulnerable flavor which demonstrates the use of
USES=vulnerable and should be used to collect upcoming ports of
vulnerable software.

The port is renamed and tweaked slightly to attempt to build in the new
location, but still builds the standard CHERI nginx.