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ei: keep a copy of the fd to avoid closing it

Peter Hutterer requested to merge whot/snegg:wip/keep-fd into main

libei takes ownership of the fd but in Python doesn't know that. So let's keep a copy of the fd in our class so it doesn't get closed in what is the most obvious code:

def setup():
    f = open("...")
    ctx = snegg.ei.Sender.create_for_fd(fd)
    # here Python calls f.close() if we don't have a copy

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