Fix a couple unused param warnings found by clang on FreeBSD
Remove usage of AI_V4MAPPED

This caused our tests to fail on FreeBSD and doesn't really add any
value.

Addresses https://github.com/facebook/libphenom/issues/49
Fix false affinity error on FreeBSD

It was succeeding but we were claiming failure

Reported in https://github.com/facebook/libphenom/issues/48