Add support of PGv < 11

Author: maksm90

collector.c

@@ -302,7 +302,11 @@ collector_main(Datum main_arg)
 	pqsignal(SIGTERM, handle_sigterm);
 	BackgroundWorkerUnblockSignals();
 
+#if PG_VERSION_NUM >= 110000
 	InitPostgres(NULL, InvalidOid, NULL, InvalidOid, NULL, false);
+#else
+	InitPostgres(NULL, InvalidOid, NULL, InvalidOid, NULL);
+#endif
 	SetProcessingMode(NormalProcessing);
 
 	/* Make pg_wait_sampling recognisable in pg_stat_activity */