Snippets for sddm-kcm 6.8.0 from Fedora s390x

Sourced from https://kojipkgs.fedoraproject.org/packages/sddm-kcm/6.8.0/1.fc46/data/logs/s390x/build.log.

• /builddir/build/BUILD/sddm-kcm-6.8.0-build/sddm-kcm-6.8.0/sddmauthhelper.cpp:46:18: warning: ignoring return value of ‘virtual bool QFile::open(QIODeviceBase::OpenMode)’, declared with attribute ‘nodiscard’ [-Wunused-result]
     46 |         file.open(QIODevice::WriteOnly);
        |         ~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~