toolchain-layer: move binutils and gcc from meta-oe into here

Acked-by: Martin Jansa <Martin.Jansa@gmail.com>
Acked-by: Eric Bénard <eric@eukrea.com>
Acked-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Koen Kooi <koen@dominion.thruhere.net>