patch 7.4.1378

Problem:    Can't change job settings after it started.
Solution:   Add job_setoptions() with the "stoponexit" flag.

src/structs.h

@@ -1253,6 +1253,8 @@ typedef enum
  */
 struct jobvar_S
 {
+    job_T	*jv_next;
+    job_T	*jv_prev;
 #ifdef UNIX
     pid_t	jv_pid;
     int		jv_exitval;
@@ -1262,6 +1264,7 @@ struct jobvar_S
     HANDLE		jv_job_object;
 #endif
     jobstatus_T	jv_status;
+    char_u	*jv_stoponexit; /* allocated */
 
     int		jv_refcount;	/* reference count */
     channel_T	*jv_channel;	/* channel for I/O, reference counted */
@@ -1386,6 +1389,7 @@ struct channel_S {
 #define JO_ERR_TIMEOUT	0x0400	/* stderr timeouts */
 #define JO_PART		0x0800	/* "part" */
 #define JO_ID		0x1000	/* "id" */
+#define JO_STOPONEXIT	0x2000	/* "stoponexit" */
 #define JO_ALL		0xffffff
 
 #define JO_MODE_ALL	(JO_MODE + JO_IN_MODE + JO_OUT_MODE + JO_ERR_MODE)
@@ -1412,6 +1416,8 @@ typedef struct
     int		jo_err_timeout;
     int		jo_part;
     int		jo_id;
+    char_u	jo_soe_buf[NUMBUFLEN];
+    char_u	*jo_stoponexit;
 } jobopt_T;