[mdns] Fix multicast routing error on esp32 (and likely other platforms) #110
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According to the RFC
(https://datatracker.ietf.org/doc/html/rfc2553#section-3.3), it is necessary to disambiguate link-local addresses with the interface index (in the scope_id field). Lacking this field, newer versions of lwip that support proper IPv6 scopes will yield EHOSTUNREACH (Host unreachable). Other implementations like on Linux and OS X will likely be affected by the lack of this field for more complex networking setups.
Fixes #100