get_interface_address6() fixes
piebeer noticed some problems with get_interface_address6() and provided a patch:
connect's third argument should be dependent on address family, otherwise connect might return einval. This apparently happened in #599 (moved) and #1141 (moved) too.
While looking at that, I noticed another issue:
the port is not set correctly for both families. Danieldg provided review and assistance for this too.
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