Headers use things in <iterator> without including it

In file included from /tmp/qtbase/src/corelib/global/qfloat16.cpp:9:
In file included from /tmp/qtb/include/QtCore/qdatastream.h:1:
/tmp/qtb/include/QtCore/../../../qtbase/src/corelib/serialization/qdatastream.h:314:34: error: no member named 'distance' in namespace 'std'
        const qint64 last = std::distance(rangeStart, it) - 1;
                            ~~~~~^
/tmp/qtb/include/QtCore/../../../qtbase/src/corelib/serialization/qdatastream.h:316:30: error: no member named 'next' in namespace 'std'
            auto next = std::next(rangeStart, i); 

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