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configure: Allow happy-2.0.2

Matthew Pickering requested to merge wip/happy-version into master

happy-2.0.2 can be used to compile GHC.

happy-2.0 and 2.0.1 have bugs which make it unsuitable to use.

The version bound is now == 1.20.* || >= 2.0.2 && < 2.1

Fixes #25276 (closed)

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