Support for "with" renaming syntax, and output a feature flag.
Summary: - Feature flag indicates to Cabal that we support thinning and renaming as it needs. - Support -package "base with (Foo as Bar)" which brings the ordinary modules into scope, as well as adding the renamings to scope. Signed-off-by: Edward Z. Yang <email@example.com> Test Plan: validate Reviewers: simonpj, austin Subscribers: thomie, carter Differential Revision: https://phabricator.haskell.org/D485
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