I agree to license my contributions to each file under the terms given at the top of each file I changed.
Co-authored-by: Marc-André Moreau <marcandre.moreau@gmail.com>
Eliminate the extra Cargo.toml that was used just for this feature. It was
too error-prone to keep it in sync with the real Cargo.toml. Having one
Cargo.toml will allow us to reliably use the `CARGO_MANIFEST_LINKS` value
to keep the symbol prefix in sync with the `links` field in Cargo.toml in
the near future.
