Remove unused enum

miner.h

@@ -1463,10 +1463,4 @@ extern struct api_data *api_add_diff(struct api_data *root, char *name, double *
 extern struct api_data *api_add_percent(struct api_data *root, char *name, double *data, bool copy_data);
 extern struct api_data *api_add_avg(struct api_data *root, char *name, float *data, bool copy_data);
 
-enum diff_calc_mode {
-  DM_BITCOIN,
-  DM_QUARKCOIN,
-  DM_LITECOIN,
-};
-
 #endif /* MINER_H */