build: fix 'make help'
Summary: This fixes the usage of `make help` in the top-level and subdirectories. Signed-off-by: Austin Seipp <firstname.lastname@example.org> Test Plan: It worked now and didn't before. Reviewers: hvr Reviewed By: hvr Subscribers: thomie Differential Revision: https://phabricator.haskell.org/D692
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