MDEV-7203: replicate_events_marked_for_skip didn't work on Galera cluster

OPTION_SKIP_REPLICATION flag needs to be preserved for events received
on non-originating nodes.

sql/wsrep_applier.cc

@@ -149,7 +149,8 @@ static wsrep_cb_status_t wsrep_apply_events(THD*        thd,
       break;
     }
 
-    thd->set_server_id(ev->server_id); // use the original server id for logging
+    /* Use the original server id for logging. */
+    thd->set_server_id(ev->server_id);
     thd->set_time();                            // time the query
     wsrep_xid_init(&thd->transaction.xid_state.xid,
                    &thd->wsrep_trx_meta.gtid.uuid,
@@ -162,6 +163,10 @@ static wsrep_cb_status_t wsrep_apply_events(THD*        thd,
       ev->when_sec_part= hrtime_sec_part(hrtime);
     }
 
+    thd->variables.option_bits=
+      (thd->variables.option_bits & ~OPTION_SKIP_REPLICATION) |
+      (ev->flags & LOG_EVENT_SKIP_REPLICATION_F ?  OPTION_SKIP_REPLICATION : 0);
+
     ev->thd = thd;
     exec_res = ev->apply_event(thd->wsrep_rgi);
     DBUG_PRINT("info", ("exec_event result: %d", exec_res));