Read `setup-config' into a strict ByteString, making sure that the
file handle does not stay open. This caused permission denied problems on MSYS where the working temp directory could not be removed after building a package because of a lingering open file. Additionally, I've uglified the qualifier for the import of Data.ByteString.Lazy.Char8, since it's ugly and potentially risky, and should be clearly visible as such.
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