Prevent need to refetch for v1 manifests #2781
Merged
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As raised in #2777 rustup is re-syncing (fetching the channel checksum) on each run pre-1.8 when overridden to do so.
This results in (a) slowdown and (b) confusion. This PR fixes that by guessing V1 installs since they're subtly different from v2 installs (ignoring the lack of manifest file which we try and self-heal on v2 installs so couldn't use as the indicator).
This should fix #2777