Fix for new API in hwloc-2.0

The API of hwloc has changed considerably for version 2.0.
For a summary check:
https://github.com/open-mpi/hwloc/wiki/Upgrading-to-v2.0-API


Test for the API version to support both the old and new API.

Signed-off-by: Egbert Eich <eich@freedesktop.org>
Signed-off-by: Egbert Eich <eich@suse.de>

Bug 3968