The GNU mirror redirector was down yet again, and I have had enough. This change replaces all mentions of ftpmirror.gnu.org with mirrors.kernel.org.
Signed-off-by: Ophestra <cat@gensokyo.uk>
This change also adds a fourth stage to the bootstrap machinery, offering more correct toolchain validation that works around LLVM dynamic linking flaws.
Signed-off-by: Ophestra <cat@gensokyo.uk>