zhanghongyu 43ecf36d78 udp: modify ipv4 multicast to allow different conn to join simultaneously
add ref count for ipv4 multicast and leave the multicast group when close
behavior alignment with linux.

Signed-off-by: zhanghongyu <zhanghongyu@xiaomi.com>
2023-11-04 17:56:06 +08:00
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