This PR adds a patch to mininet to fix a build error in openflow which occurs when the host system already has strlcpy defined. This occurs on ubuntu 24.04 for example.

I reproduced the bug and tested the solution using this Dockerfile

FROM ubuntu:24.04

RUN apt update
RUN apt install -y sudo python3

COPY ./ /mininet
WORKDIR /mininet
RUN util/install.sh -f

I initially developed this patch for containernet, a fork of mininet: https://github.com/containernet/containernet/blob/master/util/openflow-patches/strlcpy.patch

I would also be fine with opening a PR on the openflow repo to fix the issue there. :)