Remove unused SSL declarations from network.h.

There was a very old plan to flesh this out into an implementation of
SSLified Telnet, back when it looked as if that might be the winning
option for encrypted remote login. But SSH won, so that random junk in
network.h has been sitting around for decades doing nothing useful.

network.h

@@ -211,40 +211,4 @@ char *get_hostname(void);
  */
 Socket new_error_socket(const char *errmsg, Plug plug);
 
-/********** SSL stuff **********/
-
-/*
- * This section is subject to change, but you get the general idea
- * of what it will eventually look like.
- */
-
-typedef struct certificate *Certificate;
-typedef struct our_certificate *Our_Certificate;
-    /* to be defined somewhere else, somehow */
-
-typedef struct ssl_client_socket_function_table **SSL_Client_Socket;
-typedef struct ssl_client_plug_function_table **SSL_Client_Plug;
-
-struct ssl_client_socket_function_table {
-    struct socket_function_table base;
-    void (*renegotiate) (SSL_Client_Socket s);
-    /* renegotiate the cipher spec */
-};
-
-struct ssl_client_plug_function_table {
-    struct plug_function_table base;
-    int (*refuse_cert) (SSL_Client_Plug p, Certificate cert[]);
-    /* do we accept this certificate chain?  If not, why not? */
-    /* cert[0] is the server's certificate, cert[] is NULL-terminated */
-    /* the last certificate may or may not be the root certificate */
-     Our_Certificate(*client_cert) (SSL_Client_Plug p);
-    /* the server wants us to identify ourselves */
-    /* may return NULL if we want anonymity */
-};
-
-SSL_Client_Socket sk_ssl_client_over(Socket s,	/* pre-existing (tcp) connection */
-				     SSL_Client_Plug p);
-
-#define sk_renegotiate(s) (((*s)->renegotiate) (s))
-
 #endif