Linux-libre source code will be taken offline

[Leo Famulari]

According to the linux-libre team in the #gnu-linux-libre IRC channel on
Libera.chat, all releases of linux-libre before 4.4.282, 4.9.281,
4.14.245, 4.19.205, 5.4.143, 5.10.61, and 5.13.13 will be deleted from
their servers, and their Git repo is also going to be rewritten to
remove them.

So, if anybody wanted to build old versions of Guix System (or
linux-libre based on old revisions of guix.git), some third party should
preserve and mirror those files and the Git repo:

https://linux-libre.fsfla.org/pub/linux-libre/releases/
git://linux-libre.fsfla.org/releases.git

The reason for the removal is that some nonfree things were accidentally
not removed by the previous releases of the deblob scripts.