change for gcc 4.8
change for gcc 4.8

xsmart/opencvr,veyesys/opencvr,xiaojuntong/opencvr,xiaojuntong/opencvr,telecamera/opencvr,veyesys/opencvr,xiaojuntong/opencvr,herocodemaster/opencvr,telecamera/opencvr,veyesys/opencvr,xsmart/opencvr,xsmart/opencvr,telecamera/opencvr,xsmart/opencvr,veyesys/opencvr,xiaojuntong/opencvr,xsmart/opencvr,telecamera/opencvr,herocodemaster/opencvr,herocodemaster/opencvr,veyesys/opencvr,herocodemaster/opencvr