Support net.PacketConn
Add built-in support for passing net.PacketConn around. This was possible using Fds.AddConn, but the new PacketConn support will also do correct unlinking of Unix domain sockets if necessary.
Add built-in support for passing net.PacketConn around. This was possible using Fds.AddConn, but the new PacketConn support will also do correct unlinking of Unix domain sockets if necessary.