the original implementation of config selection had a number of flaws:
* using eglChooseConfigs with lots of loops, which was okay for filtering but
also added considerable complexity and made it difficult to correctly
get all the configs
* not adding enough configs; there were a lot more color and zs formats
which weren't in the base config list
* double buffer configs were never created
* srgb configs were also never created
there will now be fewer configs than there were pre-DRIL, but this is only
because accum buffers are now gone and not because anything of value is
missing
Fixes: 3de62b2f9a ("gallium/dril: Compatibility stub for the legacy DRI loader interface")
Acked-by: Daniel Stone <daniels@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/30311>
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