Add 'log and 'outputs properties to hydra objects. This way Cuirass won't
have to go through every derivation to add those properties.
* gnu/ci.scm (package->alist, image-jobs, system-test-jobs, tarball-jobs): Add
'log and 'outputs properties.
* build-aux/hydra/guix-modular.scm (build-job): Ditto.
Add 'nix-name and 'system properties to hydra objects. This way Cuirass won't
have to go through every derivation to add those properties.
* gnu/ci.scm (package->alist, image-jobs, system-test-jobs, tarball-jobs): Add
'nix-name and 'system properties.
* build-aux/hydra/guix-modular.scm (build-job): Ditto.
_IOLBF & co. were deprecated in Guile 2.2 and removed in 3.0.
* build-aux/hydra/gnu-system.scm: Pass 'line instead of _IOLBF to 'setvbuf'.
* build-aux/hydra/guix-modular.scm: Likewise.
* build-aux/hydra/guix-modular.scm: Remove 'eval-when' form that fiddled
with '%load-path'.
(build-job): Load 'build-aux/build-self.scm' and call the procedure it
returns.
* build-aux/hydra/evaluate.scm: The 'build-things' replacement no longer
calls 'exit'.
