So far, we have a function that expands given list of NUMA nodes
into list of CPUs. But soon, we are going to need the inverse -
expand list of CPUs into list of NUMA nodes. Introduce
virNumaCPUSetToNodeset() for that.

Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
---
 src/libvirt_private.syms |  2 ++
 src/util/virnuma.c       | 59 ++++++++++++++++++++++++++++++++++++++++
 src/util/virnuma.h       |  3 ++
 3 files changed, 64 insertions(+)