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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@ -167,7 +167,7 @@ in
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buildMachinesFiles = mkOption {
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type = types.listOf types.path;
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default = [ "/etc/nix/machines" ];
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default = optional (config.nix.buildMachines != []) "/etc/nix/machines";
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example = [ "/etc/nix/machines" "/var/lib/hydra/provisioner/machines" ];
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description = "List of files containing build machines.";
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};
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