Simplify the visibility test (inspired from the OMPI trunk), and fix some m4 errors (thanks Paul!).
Simplify the visibility test (inspired from the OMPI trunk), and fix
some m4 errors (thanks Paul!).


git-svn-id: 14be032f8f42541b1a281b51ae8ea69814daf20e@4305 4b44e086-7f34-40ce-a3bd-00e031736276

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