Compile with Qt 6

Change-Id: Ie45f4dc6d44723c8992872e6c4c2e30d7257ca0c
Reviewed-by: Allan Sandfeld Jensen <allan.jensen@qt.io>

src/gui/image/qimagereader.cpp

@@ -1115,8 +1115,10 @@ bool QImageReader::autoTransform() const
     case QImageReaderPrivate::DoNotApplyTransform:
         return false;
     case QImageReaderPrivate::UsePluginDefault:
+#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
         if (d->initHandler())
             return d->handler->supportsOption(QImageIOHandler::TransformedByDefault);
+#endif
         Q_FALLTHROUGH();
     default:
         break;