Ruby

• ext/socket/lib/socket.rb (Socket.tcp_server_sockets_port0): new
  private function for allocating same port both IPv4 and IPv6.
  (Socket.tcp_server_sockets): use tcp_server_sockets_port0 for port 0.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@22007 b2dd03c8-39d4-4d8f-98ff-823fe69b080e