Uppity: enable the des-cbc cipher.

There was no way to enable it for testing purposes at all until now.
Overriding the server KEX string to mention it doesn't help when it
was prevented from getting into the list that scan_kexinit_lists will
go through afterwards to find pointers to algorithm structures.

sshserver.h

@@ -119,3 +119,5 @@ int platform_make_x11_server(Plug *plug, const char *progname, int mindisp,
                              const char *screen_number_suffix,
                              ptrlen authproto, ptrlen authdata,
                              Socket **sockets, Conf *conf);
+
+Conf *make_ssh_server_conf(void);