dns/client: fix getaddrinfo duplicates #486
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By default getaddrinfo returns answers for each socktype/protocol. Since we have no knowledge about the used socket type (SOCK_STREAM, SOCK_RAW or SOCK_DGRAM...) we can't filter with hints. So we have to check for duplicates with a list handler.
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By default getaddrinfo returns answers for each socktype/protocol. Since
we have no knowledge about the used socket type (SOCK_STREAM, SOCK_RAW
or SOCK_DGRAM...) we can't filter with hints. So we have to check for
duplicates with a list handler.