Track X outputs for zones

We needed this for wayland, so we add the same tracking for X to be
consistent - though we have no users yet.

src/bin/e_comp_x_randr.c

@@ -646,6 +646,7 @@ e_comp_x_randr_create(void)
 {
    Ecore_X_Randr_Crtc *crtcs = NULL;
    Ecore_X_Randr_Output *outputs = NULL;
+   E_Zone *zone;
    int crtcs_num = 0, outputs_num = 0, i, j, k;
    Ecore_X_Window root = ecore_x_window_root_first_get();
    E_Randr2 *r = calloc(1, sizeof(E_Randr2));
@@ -836,6 +837,8 @@ e_comp_x_randr_create(void)
                   ecore_x_randr_crtc_info_free(info);
                }
           }
+        zone = e_zone_for_id_get(s->id);
+        if (zone) zone->output = s;
         r->screens = eina_list_append(r->screens, s);
      }