D9495: Properly detect Gallium drivers with newer Mesa

[Fabian Vogt]

fvogt added a dependent revision: D9496: Fix greeter crashing with software rendering on wayland.

REPOSITORY
  R108 KWin

REVISION DETAIL
  https://phabricator.kde.org/D9495

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