common: Put debug.cc last in linking order
common: Put debug.cc last in linking order

debug.cc needs to be last in the linking order so that its global
constructors will be initialized first and destroyed last.

Signed-off-by: Colin McCabe <7b35906f1d014e74a9dc8c913eb229119df647aa@dreamhost.com>

ajnelson/ceph,ajnelson/ceph,ajnelson/ceph,ajnelson/ceph,ajnelson/ceph,ajnelson/ceph