Add Qt libs and headers

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

@@ -0,0 +1,33 @@
+// Copyright (C) 2020 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 QIODEVICEBASE_H
+#define QIODEVICEBASE_H
+
+#include <QtCore/qglobal.h>
+
+QT_BEGIN_NAMESPACE
+
+class QIODeviceBase
+{
+protected:
+    ~QIODeviceBase() = default;
+public:
+    enum OpenModeFlag {
+        NotOpen = 0x0000,
+        ReadOnly = 0x0001,
+        WriteOnly = 0x0002,
+        ReadWrite = ReadOnly | WriteOnly,
+        Append = 0x0004,
+        Truncate = 0x0008,
+        Text = 0x0010,
+        Unbuffered = 0x0020,
+        NewOnly = 0x0040,
+        ExistingOnly = 0x0080
+    };
+    Q_DECLARE_FLAGS(OpenMode, OpenModeFlag)
+};
+
+QT_END_NAMESPACE
+
+#endif // QIODEVICEBASE_H