lib/lwip: Switch to use GitHub mirror repo.
It is hopefully more reliable.
url = https://github.com/atgreen/libffi
[submodule "lib/lwip"]
path = lib/lwip
- url = https://git.savannah.gnu.org/r/lwip.git
+ url = https://github.com/lwip-tcpip/lwip.git
[submodule "lib/berkeley-db-1.xx"]
path = lib/berkeley-db-1.xx
url = https://github.com/pfalcon/berkeley-db-1.xx
