Galera build fails on debian testing/unstable

[temeo]

The compilation stops in

galera/src/replicator_smm.cpp: In member function 'void galera::ReplicatorSMM::update_state_uuid(const wsrep_uuid_t&)':
galera/src/replicator_smm.cpp:1885:16: error: 'char* strncpy(char*, const char*, size_t)' specified bound 37 equals destination size [-Werror=stringop-truncation]
         strncpy(const_cast<char*>(state_uuid_str_), os.str().c_str(),
         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
                 sizeof(state_uuid_str_));
                 ~~~~~~~~~~~~~~~~~~~~~~~~