upnp: win32: accept net-intf that support both IPv4/6

Previously when libupnp was built with IPv6 enabled only the adapters
supporting IPv6 were accepted. libupnp does support IPv4 even when built
with IPv6, this commit accept both kinds of adapters instead of
excluding the ones that does not support IPv6 at all.

(cherry picked from commit b9daafa9)
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