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Summary: My msys instance at least reports MINGW instead of MSYS for uname. This commit adjusts the regex to match either one. Without this some errors occur because of missing .exe extensions in file names. This fixes #14654 Test Plan: make Reviewers: O26 nofib, Phyx, bgamari Reviewed By: Phyx, bgamari Subscribers: bgamari, Phyx GHC Trac Issues: #14654 Differential Revision: https://phabricator.haskell.org/D4297
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