angstrom-next: add versions to build for aarch64

aarch64 needs gcc and egibc from meta-linaro to build for now.

Signed-off-by: Graeme Gregory <gg@slimlogic.co.uk>
Acked-by: Koen Kooi <koen@dominion.thruhere.net>
Signed-off-by: Khem Raj <raj.khem@gmail.com>