backend/x11: use DRI3Open to get DRM FD
Instead of relying on EGL to retrieve the DRM FD, query it from the DRI3 extension.
Use the EGL GBM platform, and drop the EGL config.
Depends on https://github.com/swaywm/wlroots/pull/2495
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Instead of relying on EGL to retrieve the DRM FD, query it from the DRI3 extension.
Use the EGL GBM platform, and drop the EGL config.
Depends on https://github.com/swaywm/wlroots/pull/2495