When VJSN is both in libvarnish and libvarnishapi, as in varnishtest,
you would think one of them took precedence, but not so on OSX.

In the shlib (libvarnishapi) text (code) symbols come from the version
in the main binary (varnishtest) which got it from libvarnish, whereas
the data symbols come from the version in libvarnishapi, so we now
hide the data symbols behind code.