grafts: Use dependency information from substitutes when possible.

This avoids starting derivation builds just for the sake of knowing the
references of their outputs, thereby restoring the expected behavior of
--dry-run when substitutes are available.

* guix/grafts.scm (non-self-references): Remove 'store' parameter, and
add 'references'.  Use it.  Update caller.
(references-oracle): New variable.
(cumulative-grafts): Add 'references' parameter and use it.  Update
callers.
(graft-derivation): Remove 'build-derivations' call.  Add call to
'references-oracle'.

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