lisp/server.el: Use just one way to pass the Emacs PID to emacsclient.
* lib-src/emacsclient.c (get_server_config): Don't read Emacs pid from the authentication file. * lisp/server.el (server-start): Don't write pid to the authentication file. (server-create-tty-frame): Don't send pid. (server-process-filter): Send pid at the start of every connection.
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