* smtp.el (smtp-via-smtp): Use `open-network-stream-as-binary' instead of

* smtp.el (smtp-via-smtp): Use `open-network-stream-as-binary' instead of
`open-network-stream'.
* pop3.el (pop3-open-server): Likewise.
* nntp.el (nntp-open-network-stream): Likewise.
* gnus-gl.el (bbb-connect-to-bbbd): Likewise.

* nntp.el (nntp-open-rlogin): Enclose `start-process' with `as-binary-process'.
(nntp-open-telnet): Likewise.

* smtp.el (smtp-coding-system): Abolished.

* nntp.el (nntp-coding-system-for-write): Abolished.
(nntp-coding-system-for-read): Abolished.

* nntp.el: Don't require `tcp'.
* nndb.el: Likewise.