Provide a function for setting the work ntime.

cgminer.c

@@ -3350,6 +3350,17 @@ static void _copy_work(struct work *work, const struct work *base_work, int noff
 		work->coinbase = strdup(base_work->coinbase);
 }
 
+void set_work_ntime(struct work *work, int ntime)
+{
+	uint32_t *work_ntime = (uint32_t *)(work->data + 68);
+
+	*work_ntime = htobe32(ntime);
+	if (work->ntime) {
+		free(work->ntime);
+		work->ntime = bin2hex((unsigned char *)work_ntime, 4);
+	}
+}
+
 /* Generates a copy of an existing work struct, creating fresh heap allocations
  * for all dynamically allocated arrays within the struct. noffset is used for
  * when a driver has internally rolled the ntime, noffset is a relative value.

miner.h

@@ -1399,6 +1399,7 @@ extern void adl(void);
 extern void app_restart(void);
 extern void clean_work(struct work *work);
 extern void free_work(struct work *work);
+extern void set_work_ntime(struct work *work, int ntime);
 extern struct work *copy_work_noffset(struct work *base_work, int noffset);
 #define copy_work(work_in) copy_work_noffset(work_in, 0)
 extern struct thr_info *get_thread(int thr_id);