Add support for device files created by tty0tty

src/3rdparty/qextserialport/src/qextserialenumerator_linux.cpp

     // (USB-serial, bluetooth-serial, 18F PICs, and so on)
     // if you know an other name prefix for serial ports please let us know
     portNamePrefixes.clear();
-    portNamePrefixes << QLatin1String("ttyACM*") << QLatin1String("ttyUSB*") << QLatin1String("rfcomm*");
+    portNamePrefixes << QLatin1String("ttyACM*") << QLatin1String("ttyUSB*") << QLatin1String("rfcomm*") << QLatin1String("tnt*");
     portNameList += dir.entryList(portNamePrefixes, (QDir::System | QDir::Files), QDir::Name);
 
     foreach (QString str , portNameList) {