Fix getaddrinfo() behaviour to be more compliant with RFC2553. Patches are obtained from itojun.   -don't filter address families which are not supported by system at    FQDN resolving.   -don't do reverse lookup
Fix getaddrinfo() behaviour to be more compliant with RFC2553. Patches are
obtained from itojun.
  -don't filter address families which are not supported by system at
   FQDN resolving.
  -don't do reverse lookup

I think I checked all lib and tools which use getaddrinfo() if
this change affect them.

Obtained from: KAME project

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