Snippets for sddm-kcm 6.7.5 from Nix x86_64-linux

Sourced from https://hydra.nixos.org/log/s76xyjgqs08d0cjgwmw1ga3066d88qwc-sddm-kcm-6.7.5.drv.

• /build/sddm-kcm-6.7.5/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);
        |         ~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~