hydra: only set buildMachinesFiles when nix.buildMachines is defined
This applies [hydra PR #432](https://github.com/NixOS/hydra/pull/432) to the NixOS module in nixpkgs: ``` commit 4efd078977e5ea20e1104783efc324cba11690bc Author: Bas van Dijk <v.dijk.bas@gmail.com> Date: Sun Dec 11 15:35:38 2016 +0100 Only set buildMachinesFiles when nix.buildMachines is defined ```
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