qbs-setup-qt needs administrative privileges on Windows with UAC turned on

If UAC is turned on on Windows, qbs-setup-qt.exe cannot be started from bash. Typical error message is "Bad file number".

It works if we rename setup-qt.exe to find-qt.exe or something else that doesn’t mention “setup”, “update” or “install”. This is a feature of Windows’ UAC. We can fix this by modifying the application manifest like for lupdate.