test/meson.build: don't build DumpZeroconfHashRing if Avahi is disabled
test/meson.build: don't build DumpZeroconfHashRing if Avahi is disabled

CM4all/beng-proxy,CM4all/beng-proxy,CM4all/beng-proxy,CM4all/beng-proxy,CM4all/beng-proxy,CM4all/beng-proxy