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Previously we would pick up Stack's Cabal version with ghc-pkg on the
global package-db. This however ignores that Stack also supports custom
Setup.hs with the Cabal version from the snapshot instead.
In cabal v2-build we have a similar problem. We used to assume that
plan.json's cabal-lib-version is used uniformly across units but this is
similarly untrue.
To fix both of these we re-stage the cabal version query to after
reconfiguring a unit, then we can just lookup the Cabal version in
setup-config.
Fixes #95
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