Revert commit r2649:   Fix Linux get_thisthread_membind on non-numa machine   hwloc_topology_get*_nodeset return NULL there, so return a full nodeset instead
Revert commit r2649:
  Fix Linux get_thisthread_membind on non-numa machine
  hwloc_topology_get*_nodeset return NULL there, so return a full nodeset instead

obj->*nodeset isn't NULL anymore on non-NUMA machines, so we can go back to
the earlier code. We'll later what happens in multi-machine topologies.

git-svn-id: 14be032f8f42541b1a281b51ae8ea69814daf20e@2665 4b44e086-7f34-40ce-a3bd-00e031736276

BlueBrain/hwloc,BlueBrain/hwloc,BlueBrain/hwloc,BlueBrain/hwloc