libvirt.spec: Package libnss_libvirt_guest.so.2

In 22f7ceb6 I've introduced another NSS module
but forgot to package it in libvirt-nss.rpm.
Signed-off-by: NMichal Privoznik <mprivozn@redhat.com>

libvirt.spec.in

@@ -1858,6 +1858,7 @@ exit 0
 
 %files nss
 %{_libdir}/libnss_libvirt.so.2
+%{_libdir}/libnss_libvirt_guest.so.2
 
 %if %{with_lxc}
 %files login-shell