Description of problem: I'm trying to correctly package the rust package called biquad and rpmbuild complains about this part of the spec file when successfully building:

%files          devel
%license %{crate_instdir}/LICENSE-APACHE
%license %{crate_instdir}/LICENSE-MIT
%doc %{crate_instdir}/CHANGELOG.md
%doc %{crate_instdir}/README.md
%{crate_instdir}/

I've compaired to the rust packages that we have in the official repos and none of them differ from this when the devel package is regarded so I don't understand why rpmbuild says:

RPM build warnings:
    File listed twice: /usr/share/cargo/registry/biquad-0.4.2/CHANGELOG.md
    File listed twice: /usr/share/cargo/registry/biquad-0.4.2/LICENSE-APACHE
    File listed twice: /usr/share/cargo/registry/biquad-0.4.2/LICENSE-MIT
    File listed twice: /usr/share/cargo/registry/biquad-0.4.2/README.md

Version-Release number of selected component (if applicable): 4.18.2

How reproducible: All the time.

Steps to Reproduce:
1. Download the proposal spec file.
2. Open a terminal window.
3. Download the crate file for biquad to ~/rpmbuild/SOURCES/.
3. cd to the location of the spec file.
4. Do urpmi rust-biquad.spec as root.
5. Now do rpmbuild -ba rust-biquad.spec and watch it reach the end when it says exit 0 where it says:

RPM build warnings:
    File listed twice: /usr/share/cargo/registry/biquad-0.4.2/CHANGELOG.md
    File listed twice: /usr/share/cargo/registry/biquad-0.4.2/LICENSE-APACHE
    File listed twice: /usr/share/cargo/registry/biquad-0.4.2/LICENSE-MIT
    File listed twice: /usr/share/cargo/registry/biquad-0.4.2/README.md
even though many of our spec files tells you to use %{crate_instdir}/ for the mentioned files.

This is NOT normal if you ask me.