nwqueue: implement change queue job entry

Implement the Queue Change Job Entry endpoint for both the old NCP 17/6d
and newer NCP 17/7b variants.

Parse the queue job structure, look up the selected job by its job number,
and update the mutable job metadata fields while preserving server-managed
state such as client identity, entry time, job number, queue position, file
name/handle and servicing information.

Allow the job creator to update the standard user-changeable fields and allow
SUPERVISOR or Q_OPERATORS members to update the operator hold flag as well.
Return the documented queue/job/right/servicing completion codes for missing
queues, missing jobs, insufficient rights and jobs already being serviced.

This only updates NetWare queue metadata. It does not change the existing
Q_UNIX_PRINT/lp backend behavior and adds no CUPS dependency.

src/nwbind.c

@@ -1720,11 +1720,13 @@ static void handle_fxx(int gelen, int func)
                   break;
 
 #if 1
+     case 0x6D:   /* Change Queue Job Entry old */
      case 0x7B:   /* Change Queue Job Entry */
                   {
                     uint32 q_id   = GET_BE32(rdata);
-                 /*   uint32 job_id = GET_BE16(rdata+4); */
-                    int result    = nw_change_queue_job_entry(q_id, rdata+4);
+                    int result    = nw_change_queue_job_entry(act_c->object_id,
+                                                              q_id, rdata+4,
+                                                              ufunc==0x6D);
                     if (result < 0)  
                       completition=(uint8)-result;
                   }