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This logic doesn't really do what it pretends to; we don't expose the RGTC features unless we actually have RGTC support. This is about to change, but for that logic to work, we need to be able to tell if we're using a fallback-format or not, and we can't do that unless we keep the format as RGTC. Reviewed-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com> Acked-by: Eric Engestrom <eric@igalia.com> Tested-by: Eric Engestrom <eric@igalia.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/18248>