meson: delete dri3 build option (!30952) · Merge requests · Mesa / mesa · GitLab

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Mike Blumenkrantz requested to merge zmike/mesa:dri3 into main Aug 30, 2024

What does this MR do and why?

meson: delete dri3 build option

this existed for historical reasons, but realistically now it should
be possible to build mesa with dri3 always enabled. additionally,
this check was often used as a substitute for having drm functionality,
which is sort of similar but also not really a direct match

this simplifies a bunch of conditionals and prevents users from footgunnning
themselves into orbit