patch 7.4.1336

Problem:    Channel NL mode is not supported yet.
Solution:   Add NL mode support to channels.

src/structs.h

@@ -1372,6 +1372,14 @@ struct channel_S {
     int		ch_refcount;	/* reference count */
 };
 
+/*
+ * Options for job commands.
+ */
+typedef struct
+{
+    ch_mode_T	jo_mode;
+} jobopt_T;
+
 
 /* structure used for explicit stack while garbage collecting hash tables */
 typedef struct ht_stack_S