patch 7.4.1398
Problem:    The close-cb option is not implemented yet.
Solution:   Implemente close-cb. (Yasuhiro Matsumoto)
diff --git a/src/proto/channel.pro b/src/proto/channel.pro
index fa06f4f..81935bf 100644
--- a/src/proto/channel.pro
+++ b/src/proto/channel.pro
@@ -7,10 +7,10 @@
 void channel_free(channel_T *channel);
 void channel_gui_register(channel_T *channel);
 void channel_gui_register_all(void);
-channel_T *channel_open(char *hostname, int port_in, int waittime, void (*close_cb)(void));
+channel_T *channel_open(char *hostname, int port_in, int waittime, void (*nb_close_cb)(void));
 void channel_set_pipes(channel_T *channel, sock_T in, sock_T out, sock_T err);
 void channel_set_job(channel_T *channel, job_T *job);
-void channel_set_options(channel_T *channel, jobopt_T *options);
+void channel_set_options(channel_T *channel, jobopt_T *opt);
 void channel_set_req_callback(channel_T *channel, int part, char_u *callback, int id);
 char_u *channel_get(channel_T *channel, int part);
 int channel_collapse(channel_T *channel, int part);