platform: properly handle IPv4 peer-addresses
The peer-address (IFA_ADDRESS) can also be all-zero (0.0.0.0). That is distinct from an usual address without explicit peer-address, which implicitly has the same peer and local address. Previously, we treated an all-zero peer_address as having peer and local address equal. This is especially grave, because the peer is part of the primary key for an IPv4 address. So we not only get a property of the address wrong, but we wrongly consider two different addresses as one and the same. To properly handle these addresses, we always must explicitly set the peer.
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