Upgrade Cabal submodule to latest HEAD, change to package key calculation.
Summary: One notable change is that the package key calculation algorithm in Cabal has changed (from an undocumented format based on Show instances to a fully specified format), so you will need to do a full rebuild. I'd greatly prefer if this could be merged to 7.10. Signed-off-by: Edward Z. Yang <firstname.lastname@example.org> Test Plan: validate Reviewers: austin Subscribers: GHC Trac Issues:
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