setup-qt: Fix detection for 32-bit MSVC
setup-qt: Fix detection for 32-bit MSVC

The installer directory names do not contain the architecture in that
case.

Change-Id: I072df4260eefff7dd15d90770c73e1187e7f72cc
Reviewed-by: Joerg Bornemann <47777b9406dbddd02a3fdca8341789a013805a11@qt.io>

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