Drop COMPAT_INET4 support
Detail: Fill in the sockaddr_in address length, cater for varying ifconf entry size. Use agnostic TCPIPLibs: include path, so CI works. Admin: Submission for TCP/IP bounty.
Detail: Fill in the sockaddr_in address length, cater for varying ifconf entry size. Use agnostic TCPIPLibs: include path, so CI works. Admin: Submission for TCP/IP bounty.