) add COPYRIGHT*.html files to the rustc binary distribution
) add contents of LICENSE folder to dist tarballs, because some of our in-tree licences will require that the license text is reproduced.
) The wording of COPYRIGHT is adjusted to not include license text (`reuse` ensures that it's in the LICENSE folder)
) A blanket copyright notice is added to LICENCE-MIT as required by the text.
The general approach is that the license statements are now compiled using a tool in CI (generate-copyright), and you get either:
* the source code (COPYRIGHT, LICENCE-APACHE, LICENCE-MIT, REUSE.toml and the LICENCES folder), or
* the compiled version (COPYRIGHT.html, COPYRIGHT-library.html and the LICENCES folder).
We only run reuse once, so the output has to be filtered to find only the files that are relevant to the library tree.
Outputs build/COPYRIGHT.html and build/COPYRIGHT-library.html.
This tool now scans for cargo dependencies and includes any important looking license files.
We do this because cargo package metadata is not sufficient - the Apache-2.0 license says you have to include any NOTICE file, for example. And authors != copyright holders (cargo has the former, we must include the latter).
Now that we have reuse-tool 4.0, we no longer need to massage the JSON license data to collapse LLVM into a single copyright notice and license - reuse-tool can do it for us using an annotation in REUSE.toml.
This effectively reverts c6eb03b.
