Ryzen stages available for download

[drobbins]

Ryzen stages are now available for download at the following links:

https://build.funtoo.org/funtoo-current/x86-64bit/amd64-zen/

https://build.funtoo.org/funtoo-current/pure64/amd64-zen-pure64/

A new pure64 stage is building right now.

Also, many thanks to CDN77 for sponsoring Funtoo -- our downloads now use a combined funtoo/CDN77 infrastructure for world-wide speed rather than a mirroring infrastructure. This applies to stage3 downloads as well as fastpull downloads.