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Add -Wmissing-deriving-strategies

Ben Gamari requested to merge wip/D5451 into master

Warn users when -XDerivingStrategies is enabled but not used, at each potential use site.

add -Wmissing-deriving-strategies

Reviewers: bgamari, RyanGlScott

Subscribers: andrewthad, rwbarton, carter

GHC Trac Issues: #15798 (closed)

Differential Revision: https://phabricator.haskell.org/D5451

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