use proper $PATH (with GHC available) doing source map hashing #4467
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Fixes #4466
I'm not quite sure how to cover this in tests: it appears that currently our integration tests don't clean
$PATH
and making that looks to be a noticeable effort: for that we need to check all of the current integration tests and fix any that will fail. @snoyberg I guess it makes sense to do that in a separate issue?