Tolerate dependencies outside the repo when adding to cache #82
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Tolerate dependencies outside the repo when adding to cache.
This supports scenarios like NerdBank.GitVersioning which end up adding a projects inside the package to the graph, which ends up getting ignored.
Before this change, this would result in all cache misses for repos using NerdBank.GitVersioning.
Note that projects outside of the repo which are built in this manner are not considered at all for cache fingerprinting, so any changes in those projects will not cause projects to rebuild, just like any other file read outside the repo (and outside NuGet packages).