Qt provider: Make sure not to invoke qtchooser directly
Qt provider: Make sure not to invoke qtchooser directly

In some Linux distributions, qmake is a soft link to qtchooser, which
only behaves like qmake if invoked via that name.

Change-Id: I6705a81f6a4dfdda5fd3f1e16a63318a4b772084
Reviewed-by: Joerg Bornemann <47777b9406dbddd02a3fdca8341789a013805a11@qt.io>

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