UdpContext::setMulticastInterface(): fix for IPv6 #5743
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Per 'udp_set_multicast_netif_addr()' signature and comments in lwIP sources: An IPv4 address designating a specific interface must be used. When an IPv6 address is given, the matching IPv4 in the same interface must be selected. fix esp8266@e3bc3c2#r32235572
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Per 'udp_set_multicast_netif_addr()' signature and comments in lwIP sources:
An IPv4 address designating a specific interface must be used.
When an IPv6 address is given, the matching IPv4 in the same interface must be selected.
fix e3bc3c2#r32235572