[WASI] failing System.Net.NameResolution tests

[pavelsavara]

DnsBeginGetHostAddresses_BadName_Throws
DnsObsoleteBeginGetHostByName_IPv4String_ReturnsOnlyGivenIP
DnsObsoleteGetHostByName_EmptyString_ReturnsHostName
DnsGetHostEntry_BadName_ThrowsSocketException
DnsGetHostEntry_LocalHost_ReturnsFqdnAndLoopbackIPs
TryGetAddrInfo_LocalHost
TryGetAddrInfo_EmptyHost

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