Fix links metadata in manifest

[kxxt]

The links field should not contain the lib prefix, as documented in

• https://doc.rust-lang.org/cargo/reference/manifest.html#the-links-field
• https://doc.rust-lang.org/cargo/reference/build-scripts.html#the-links-manifest-key

[alexforster]

Thanks! Want me to cut a release for this?

[kxxt]

Thanks! Want me to cut a release for this?

Thanks for the quick merge!
This links field mostly serves as metadata. The build script links libbpf fine. So a new release would be nice but not required, given that it seems I am the first one to discover that this field is wrong.