Add conditional macro LV_USE_GROUP to more GROUP related singles:

- LV_SIGNAL_CONTROL
- LV_SIGNAL_GET_EDITABLE

src/lv_widgets/lv_textarea.c

@@ -1466,6 +1466,7 @@ static lv_res_t lv_textarea_signal(lv_obj_t * ta, lv_signal_t sign, void * param
         }
     }
     else if(sign == LV_SIGNAL_CONTROL) {
+#if LV_USE_GROUP
         uint32_t c = *((uint32_t *)param); /*uint32_t because can be UTF-8*/
         if(c == LV_KEY_RIGHT)
             lv_textarea_cursor_right(ta);
@@ -1486,10 +1487,13 @@ static lv_res_t lv_textarea_signal(lv_obj_t * ta, lv_signal_t sign, void * param
         else {
             lv_textarea_add_char(ta, c);
         }
+#endif
     }
     else if(sign == LV_SIGNAL_GET_EDITABLE) {
+#if LV_USE_GROUP
         bool * editable = (bool *)param;
         *editable       = true;
+#endif
     }
     else if(sign == LV_SIGNAL_PRESSED || sign == LV_SIGNAL_PRESSING || sign == LV_SIGNAL_PRESS_LOST ||
             sign == LV_SIGNAL_RELEASED) {