A new stage-qa test has been added, it reports all shared libraries
dependencies that are not part of the port list of dependencies. It help
finds what is called proxy dependencies.

A is needed by B, and B is needed by C. If C also needs A, then it needs to
be registered, and this check will tell you to do so.

Right now, it is only reporting the problems, but if you add
PROXYDEPS_FATAL=yes to your environment, it will give an error and will force
you to fix the dependencies.

PR: 195203
Submitted by: yuri rawbw com (earlier version)
Sponsored by: Absolight
Differential Revision: https://reviews.freebsd.org/D6531