Only include parthelper if built with storage_disk

Parthelper is only compiled if both --with-libvirtd
and --with-storage-disk are set.
Signed-off-by: NRuben Kerkhof <ruben@rubenkerkhof.com>

AUTHORS

@@ -178,6 +178,7 @@ Patches have also been contributed by:
   Michael Chapman      <mike@very.puzzling.org>
   Daniel Gollub        <gollub@b1-systems.de>
   David S. Wang        <dwang2@cisco.com>
+  Ruben Kerkhof        <ruben@rubenkerkhof.com>
 
   [....send patches to get your name here....]
 

libvirt.spec.in

@@ -1016,7 +1016,10 @@ fi
 %attr(0755, root, root) %{_libexecdir}/libvirt_lxc
 %endif
 
+%if %{with_storage_disk}
 %attr(0755, root, root) %{_libexecdir}/libvirt_parthelper
+%endif
+
 %attr(0755, root, root) %{_libexecdir}/libvirt_iohelper
 %attr(0755, root, root) %{_sbindir}/libvirtd