On Linux 5.4, build WireGuard from backports. Linux 5.10 contains
wireguard in-tree.
Add in-kernel crypto libraries required by WireGuard along with
arch-specific optimizations.
Signed-off-by: Ilya Lipnitskiy <ilya.lipnitskiy@gmail.com>
Signed-off-by: maurerr <mariusd84@gmail.com>