I think this might be better than handling it in the service. I'm seeing
locale issues on the hurd which I hope this will address.
* gnu/packages/package-management.scm (guix-build-coordinator,
guix-build-coordinator/agent-only):
* gnu/services/guix.scm (guix-build-coordinator-shepherd-services,
guix-build-coordinator-agent-shepherd-services):
Change-Id: I07ca424f434854176326a19177dc5573d53b59c2