ovirt-node-plugin-vdsm.spec: remove autoreconf

Not required to re-run autoreconf.
Source .tar.gz (make dist) already executed autoreconf to generate the files.

Change-Id: Ie0b3dd0f38e3cb7590cac1fbca8f0d97b41027ae
Signed-off-by: Douglas Schilling Landgraf <dougsland@redhat.com>