libstdc++: Fix preprocessor check for C++17
libstdc++-v3/ChangeLog: * include/bits/regex.h (basic_regex::multiline): Fix #if condition.
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@ -424,7 +424,7 @@ _GLIBCXX_BEGIN_NAMESPACE_CXX11
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static constexpr flag_type awk = regex_constants::awk;
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static constexpr flag_type grep = regex_constants::grep;
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static constexpr flag_type egrep = regex_constants::egrep;
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#if __cplusplus >= 2017
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#if __cplusplus >= 201703L
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static constexpr flag_type multiline = regex_constants::multiline;
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#endif
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///@}
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