Couldn't figure out how to get -Wno-#warning into project file

Not sure what qmake # escape is. So fixed the problem instead.

src/ui/map/QGCMapWidget.cc

@@ -267,15 +267,12 @@ void QGCMapWidget::loadSettings(bool changePosition)
     if (trailType == mapcontrol::UAVTrailType::ByDistance)
     {
         // XXX
-#ifdef Q_OS_WIN
-#pragma message ("WARNING: Settings loading for trail type not implemented")
-#else
-#warning Settings loading for trail type not implemented
-#endif
+        qDebug() << "WARNING: Settings loading for trail type (ByDistance) not implemented";
     }
     else if (trailType == mapcontrol::UAVTrailType::ByTimeElapsed)
     {
         // XXX
+        qDebug() << "WARNING: Settings loading for trail type (ByTimeElapsed) not implemented";
     }
 
     // SET TRAIL TYPE