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Support mtl-2.3

Bodigrim requested to merge Bodigrim/haddock:support-mtl-2.3 into ghc-head

Starting from mtl-2.3 liftM is no longer re-exported from Control.Monad by Control.Monad.Writer.Strict. A simple backward-compatible fix is to replace liftM with fmap.

Cf. ghc!9370 (closed), ghc#21587 (closed) and https://github.com/haskell/haddock/pull/1535

Edited by Bodigrim

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