kraken: fix compilation on debian7
kraken: fix compilation on debian7

Tisseo/navitia,xlqian/navitia,antoine-de/navitia,lrocheWB/navitia,patochectp/navitia,ballouche/navitia,patochectp/navitia,Tisseo/navitia,CanalTP/navitia,Tisseo/navitia,antoine-de/navitia,kadhikari/navitia,pbougue/navitia,pbougue/navitia,kinnou02/navitia,patochectp/navitia,kinnou02/navitia,prhod/navitia,lrocheWB/navitia,xlqian/navitia,ballouche/navitia,kadhikari/navitia,prhod/navitia,lrocheWB/navitia,antoine-de/navitia,CanalTP/navitia,ballouche/navitia,Tisseo/navitia,TeXitoi/navitia,pbougue/navitia,CanalTP/navitia,TeXitoi/navitia,kadhikari/navitia,prhod/navitia,kinnou02/navitia,Tisseo/navitia,xlqian/navitia,TeXitoi/navitia,lrocheWB/navitia,antoine-de/navitia,patochectp/navitia,kinnou02/navitia,ballouche/navitia,prhod/navitia,CanalTP/navitia,pbougue/navitia,xlqian/navitia,kadhikari/navitia,CanalTP/navitia,TeXitoi/navitia,xlqian/navitia