pub fn links(&self) -> Option<&'g str> {
        self.inner.links.as_ref().map(|x| x.as_ref())
    }
Returns the name of a native library this package links to, if specified.

This is the same as the `links` field of `Cargo.toml`. See [The `links` Manifest
Key](https://doc.rust-lang.org/cargo/reference/build-scripts.html#the-links-manifest-key) in
the Cargo book for more details.
guppy/src/graph/graph_impl.rs