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This ensures that artifacts built with build-prog see these options. Also spruce up comments. Test Plan: Carefully read it. Reviewers: austin, hvr, erikd Reviewed By: erikd Subscribers: thomie, erikd Differential Revision: https://phabricator.haskell.org/D2673 (cherry picked from commit e2a9b529a8b06e2dace8c2b4c58710cf5e57ef03)
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