boost: drop boost threads for upnp

src/qt/optionsmodel.cpp

@@ -315,7 +315,12 @@ bool OptionsModel::setData(const QModelIndex & index, const QVariant & value, in
             break;
         case MapPortUPnP: // core option - can be changed on-the-fly
             settings.setValue("fUseUPnP", value.toBool());
-            MapPort(value.toBool());
+            if (value.toBool()) {
+                StartMapPort();
+            } else {
+                InterruptMapPort();
+                StopMapPort();
+            }
             break;
         case MinimizeOnClose:
             fMinimizeOnClose = value.toBool();