tests/ports/FreeBSD: reenable pthread affinity_...
tests/ports/FreeBSD: reenable pthread affinity_...

tests/ports/FreeBSD: reenable pthread affinity_np prototypes

Add a dummy pthread.h to prevent the Linux one from causing conflicts.

This commit was SVN r5130.

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