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This imports @bgamari's sync script into the mirror script and adds a backup url for packages. The idea is that the URLs won't need updating when updating the tarballs from now on. It will first try haskell.org, failing that it'll try repo.msys2.org Test Plan: try new command `mk/get-win32-tarballs.sh sync` Reviewers: austin, bgamari Reviewed By: bgamari Subscribers: rwbarton, thomie, bgamari Differential Revision: https://phabricator.haskell.org/D3488
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