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CircleCI: two cache save/restore mechanisms. One bound to musl-cross+patches, one for modules + patches. * Replacing the generic cache bound to CircleCI user to have two caches levels. One for musl-cross and its patchsets, one for all modules and their patchset being the same. So if modules changed, we use the cache for musl-cross as a fallback to economize one hour of precious build time out of two, while most of Heads changes are on the scripts and can be built on top of packages+patches cache