only restore the backup if we created it, an aborted autogen.sh can leave a stale backup.
only restore the backup if we created it, an aborted autogen.sh can leave a stale backup.


kongr45gpen/bzflag-import-1,kongr45gpen/bzflag-import-1,kongr45gpen/bzflag-import-1,kongr45gpen/bzflag-import-1,kongr45gpen/bzflag-import-1,kongr45gpen/bzflag-import-1