mesa: Add rustfmt.toml
Unless rustfmt gets informed that we use the 2021 edition, it chokes on C-string literals. Passing the `--edition` parameter with every invocation would be annoying. Create a config file instead. Reviewed-by: Faith Ekstrand <faith.ekstrand@collabora.com> Reviewed-by: Karol Herbst <kherbst@redhat.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/31510>
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