Notice non-toplevel dll dependencies in rustbuild

Previously Cargo would hardlink all the dependencies into the "root" as
foo.dll and the `toplevel` array would get populated with these, but
that's no longer the case. Instead, cargo will only do this for the
final artifacts/final libraries.

Rustbuild is updated to continue looping through the artifacts mentioned
instead of early-returning. This should fix the bug.

@alexcrichton found the cause of this and suggested this fix.

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