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Description
At some point, the KMS/DRM backend double buffering feature stopped working in SDL2 because someone removed SDL_KMSDRM_DOUBLE_BUFFER environment variable (in favor of SDL_VIDEO_DOUBLE_BUFFER I guess?) but didn't wire up the environment variable evaluation code in the KMS/DRM backend code.
This core simply fixes that so double buffering works again on the KMS/DRM backend.