Commits on Jul 2, 2022

1. Fix caching bug in download-rustc = true …

   When moving this to rustbuild, I introduced a bug: if you had the file already downloaded, but
   deleted the sysroot for whatever reason, rustbuil would fail to unpack the cached tarball.
   
   This only affects people if they have a cached tarball, which is probably why we haven't seen an issue yet -
   wiping `build/cache` would work around the issue, or just not deleting `build/$TARGET/stage2`.

   

   jyn514 committed Jul 2, 2022
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