hwloc.pc: use HWLOC_LIBS instead of LIBS for Libs.private
hwloc.pc: use HWLOC_LIBS instead of LIBS for Libs.private

Thanks to Erik Schnetter for reporting a problem.

git-svn-id: 14be032f8f42541b1a281b51ae8ea69814daf20e@5219 4b44e086-7f34-40ce-a3bd-00e031736276

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