Fix the Linux cpusets code to work un fsys_root
Fix the Linux cpusets code to work un fsys_root

This commit was SVN r304.

ggouaillardet/hwloc,ggouaillardet/hwloc,shekkbuilder/hwloc,ggouaillardet/hwloc,ggouaillardet/hwloc,shekkbuilder/hwloc,shekkbuilder/hwloc,shekkbuilder/hwloc