For our archive.archlinux.org website instead of always redirecting to
archive.org try if we have the file and fallback redirecting to
archive.org. This reduces the load on archive.org and makes our
reproducible builds downloads faster then archive.org. This also set's
up another archive mirror on archive.ger.mirror.pkgbuild.com

Signed-off-by: Jelle van der Waa <jelle@archlinux.org>