Fix build with older compilers
Fix build with older compilers

This amends d38fd9fa9.

Change-Id: I55661497de04749dfd27134ef7c8c9cc436053e2
Reviewed-by: Christian Kandeler <3aa99dcdd3f0cac61fb81c2a11771c0cc2497607@qt.io>
Reviewed-by: Eike Ziller <c142da16c73a95a82d35191bcc55b22835617128@qt.io>

qtproject/qt-labs-qbs,qt-labs/qbs,qt-labs/qbs,qtproject/qt-labs-qbs,qtproject/qt-labs-qbs,qt-labs/qbs,qtproject/qt-labs-qbs,qt-labs/qbs,qt-labs/qbs,qt-labs/qbs,qtproject/qt-labs-qbs,qtproject/qt-labs-qbs,qtproject/qt-labs-qbs,qt-labs/qbs