Remove NoArrayLength usage

Solves the following build error:
make[3]: Entering directory '/home/elmarco/src/gnome/rygel/src/rygel'
  VALAC    rygel_vala.stamp
  rygel-cmdline-config.vala:40.6-40.18: warning: attribute
  `NoArrayLength' never used
      [NoArrayLength]
           ^^^^^^^^^^^^^
           rygel-cmdline-config.vala:63.6-63.18: warning: attribute
  `NoArrayLength' never used
      [NoArrayLength]
           ^^^^^^^^^^^^^
           rygel-cmdline-config.vala:66.6-66.18: warning: attribute
  `NoArrayLength' never used
      [NoArrayLength]
           ^^^^^^^^^^^^^
           rygel-cmdline-config.vala:69.6-69.18: warning: attribute
  `NoArrayLength' never used
      [NoArrayLength]
           ^^^^^^^^^^^^^
Compilation failed: 0 error(s), 4 warning(s)
Makefile:791: recipe for target 'rygel_vala.stamp' failed

https://bugzilla.gnome.org/show_bug.cgi?id=741913
tracker: update_async throws GLib.Error

Solves the following build error:

make[4]: Entering directory '/home/elmarco/src/gnome/rygel/src/plugins/tracker'
VALAC    librygel_tracker_la_vala.stamp
rygel-tracker-selection-query.vala:90.24-90.50: warning: unhandled error `GLib.Error'
result = yield resources.query_async (str);
^^^^^^^^^^^^^^^^^^^^^^^^^^^
rygel-tracker-cleanup-query.vala:49.15-49.42: warning: unhandled error `GLib.Error'
yield resources.update_async (str);
^^^^^^^^^^^^^^^^^^^^^^^^^^^^
rygel-tracker-insertion-query.vala:129.27-129.60: warning: unhandled error `GLib.Error'
Variant v = yield resources.update_blank_async (str);
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
rygel-tracker-insertion-query.vala:144.32-145.71: warning: unhandled error `GLib.Error'
rygel-tracker-deletion-query.vala:48.15-48.42: warning: unhandled error `GLib.Error'
yield resources.update_async (str);
^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Compilation failed: 0 error(s), 5 warning(s)
Makefile:1167: recipe for target 'librygel_tracker_la_vala.stamp' failed

https://bugzilla.gnome.org/show_bug.cgi?id=741913