Allow local installs of mutable snapshot packages #4588
Merged
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Tested manually.
Fixes #4578
With https://github.com/commercialhaskell/stack/blob/master/doc/build-overview.md being implemented we now have local installs of snapshot packages getting marked as mutable, i.e. having mutable (local) dependencies. This change removes reinstallation of those packages from snapshots.