• Fix Socket.t to use ok() instead of is() where required - RT73039
  
• Complete rewrite of module docs; list all the constants and
  functions, updated SYNOPSIS
  
• Added convenient Exporter tag :addrinfo for all the gai/gni-related
  symbols
  
• Provide static synthesized newSVpvn_flags() replacement for older
  Perls
  
• Implement getnameinfo() NIx_NOHOST and NIx_NOSERV extension flags