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The official Windows builds of Boost have internal implementations for `zlib` and `bzip2` libraries used by Boost::iostreams library, e.g. * boost_bzip2-vc140-mt-1_59.lib * boost_zlib-vc140-mt-1_59.lib Add check headers for these so that users can specify them as components without any warnings. Reviewed-by: Roger Leigh <rleigh@dundee.ac.uk>
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