Disable the build-queued hook

This can take an excessive amount of time. For example, on hydra.nixos.org, a call to hydra-notify takes 0.7s even if there are no plugins. So for an eval with ~45K new builds, the calls to hydra-notify add up to about 9 hours.

The proper fix would be to pass a list of build IDs, or an eval ID.

Created by  Eelco Dolstra  on June 22, 2017
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