Can't build releases older than 2021a due to missing cyberbotics-hosted dependencies

[DaviAntonio]

Describe the Bug It is impossible to build a webots release older than 2021a due to missing dependencies that should be available at https://cyberbotics.com/files/repository/dependencies/linux64/release

Steps to Reproduce

1. Try to build any webots release older than 2021a

Expected behavior All the cyberbotics-hosted dependencies from dependencies/Makefile.linux should be successfully downloaded.

System

• Operating System: any GNU/Linux-based operating system

Additional context Trying to manually download most of the files listed in the aforementioned Makefile result in a HTTP 404 error.

[Kreijstal]

If this is important to you, vendored dependencies can be found on cyberbotics itself for example https://github.com/cyberbotics/picotts https://github.com/assimp/assimp https://github.com/wgois/OIS etc... and you will have to compile them