*: add XREF_SETUP() to libraries and utilites

*: add XREF_SETUP() to libraries and utilites

This is theoretically not needed if neither DEFUNs nor zlog_* calls are
used, except I'm about to turn it into a build error to catch the cases
where it _is_ necessary.  Which is libmgmt_be_nb.la in this case, where
it causes build failures on hppa.

Signed-off-by: David Lamparter <equinox@opensourcerouting.org>