use the same struct name for the hwloc_cpuset_t typedef as in cpuset.c, to let cpuset.c include it for checks. add hwloc_const_cpuset_t for constant cases
use the same struct name for the hwloc_cpuset_t typedef as in cpuset.c, to let cpuset.c include it for checks. add hwloc_const_cpuset_t for constant cases

git-svn-id: 14be032f8f42541b1a281b51ae8ea69814daf20e@1166 4b44e086-7f34-40ce-a3bd-00e031736276

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