Snippets for sddm-kcm 6.8.0 from Alpine loongarch64

Sourced from https://build.alpinelinux.org/buildlogs/build-edge-loongarch64/community/sddm-kcm/sddm-kcm-6.8.0-r0.log.

• /home/buildozer/aports/community/sddm-kcm/src/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);
        |         ~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~