test: link against all enabled libs

test: link against all enabled libs

Rather than maintaining a list of the libraries the unit tests need, and
having to conditionally include/omit optional libs from the list, we can
just link against all available libraries, simplifying the code
considerably.

Signed-off-by: Bruce Richardson <bruce.richardson@intel.com>
Acked-by: Stephen Hemminger <stephen@networkplumber.org>
Acked-by: Morten Brørup <mb@smartsharesystems.com>
Acked-by: David Marchand <david.marchand@redhat.com>