Multi-port interfaces are stored in the network config as an array using
the ports key.

Single LAN and WAN interfaces are now stored in the network configs
"device" key.

Replace occurences of ar71xx with ath79. Remove references of ar71xx
targets which are not relevant anymore.

These config changes are not necessary anymore, as it's now the default
behavior.

Ref: https://github.com/freifunk-gluon/gluon/pull/2235#issuecomment-859654947


Signed-off-by: David Bauer <mail@david-bauer.net>

All targets now use OpenWrt device abstraction. Thus, all targets now
can be built using a per-device RootFS.

Signed-off-by: David Bauer <mail@david-bauer.net>

Signed-off-by: David Bauer <mail@david-bauer.net>

The kernel build requires rsync.

ramips-mt76x8: add Xiaomi Mi Router 4A (100M Edition)

gluon-mesh-vpn-core: fix potential null pointer dereferences

gluon-mesh-vpn-tunneldigger: fix Lua mesh-vpn provider module location

read_stdout can return NULL and thus the return value need to be checked
prior to accessing it.

Signed-off-by: David Bauer <mail@david-bauer.net>

In case the limit_ingress or limit_egress options are not present in
gluon's mesh_vpn section the respondd provider compares a string literal
with a NULL pointer, crashing respondd.

Check both pointers prior to comparing them in order to mitigate this
issue.

Suggested-by: Matthias Schiffer <mschiffer@universe-factory.net>
Signed-off-by: David Bauer <mail@david-bauer.net>

treewide: use lua-jsonc instead of lua-cjson for JSON handling during build