Add Qt libs and headers

paho-mqtt3as-proxy/Qt/include/QtCore/qpair.h

@@ -0,0 +1,27 @@
+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
+
+#ifndef QPAIR_H
+#define QPAIR_H
+
+#include <QtCore/qglobal.h>
+
+QT_BEGIN_NAMESPACE
+
+#if 0
+#pragma qt_class(QPair)
+#endif
+
+template <typename T1, typename T2>
+using QPair = std::pair<T1, T2>;
+
+template <typename T1, typename T2>
+constexpr decltype(auto) qMakePair(T1 &&value1, T2 &&value2)
+    noexcept(noexcept(std::make_pair(std::forward<T1>(value1), std::forward<T2>(value2))))
+{
+    return std::make_pair(std::forward<T1>(value1), std::forward<T2>(value2));
+}
+
+QT_END_NAMESPACE
+
+#endif // QPAIR_H