vdsm.spec: avoid require numactl to some platforms

Avoid numactl issues with s390, s390x, arm platforms.
Patch provided by Cole Robinson <crobinso@redhat.com>.

Change-Id: Ib27940d6ba02e361c7d8fa0fe8a4daa187b5c6e6
Signed-off-by: Douglas Schilling Landgraf <dougsland@redhat.com>
Reviewed-on: http://gerrit.ovirt.org/33306
Reviewed-by: Cole Robinson <aintdiscole@gmail.com>
Reviewed-by: Dan Kenigsberg <danken@redhat.com>