D9496: Fix greeter crashing with software rendering on wayland

[Fabian Vogt]

fvogt added a dependency: D9495: Properly detect Gallium drivers with newer Mesa.

REPOSITORY
  R133 KScreenLocker

REVISION DETAIL
  https://phabricator.kde.org/D9496

To: fvogt, #plasma, graesslin
Cc: plasma-devel, ZrenBot, progwolff, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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