package/docker-engine: fix port forwarding for hosts without IPv6

package/docker-engine: fix port forwarding for hosts without IPv6

docker-engine 20.10.6 broke container port forwarding for hosts without IPv6
support:

docker: Error response from daemon: driver failed programming external
connectivity on endpoint naughty_moore
(038e9ed4b5ea77e1c52462d6d04ad001fbad9beb185a6511aadc217c8a271608): Error
starting userland proxy: listen tcp6 [::]:80: socket: address family not
supported by protocol.

Add a libnetwork patch from an upstream pull request to fix this, after
adjusting the patch to apply to docker-engine (which has libnetwork vendored
under vendor/github.com/docker/libnetwork):

- https://github.com/moby/libnetwork/pull/2635,
- https://github.com/moby/moby/pull/42322

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>