Fix warnings in apps/openni_tracking.cpp
Fix warnings in apps/openni_tracking.cpp

> openni_tracking.cpp:452:72: warning: unused parameter 'normals' [-Wunused-parameter]

wgapl/pcl,raydtang/pcl,shivmalhotra/pcl,pkuhto/pcl,kanster/pcl,the-glu/pcl,zhangxaochen/pcl,nikste/pcl,LZRS/pcl,ipa-rmb/pcl,ipa-rmb/pcl,soulsheng/pcl,sbec/pcl,ResByte/pcl,stfuchs/pcl,RufaelDev/pcc-mp3dg,ResByte/pcl,KevenRing/pcl,KevenRing/vlp,3dtof/pcl,chenxingzhe/pcl,stfuchs/pcl,LZRS/pcl,damienjadeduff/pcl,kanster/pcl,lydhr/pcl,nikste/pcl,shangwuhencc/pcl,stefanbuettner/pcl,cascheberg/pcl,fskuka/pcl,shangwuhencc/pcl,mschoeler/pcl,sbec/pcl,soulsheng/pcl,MMiknis/pcl,shyamalschandra/pcl,damienjadeduff/pcl,raydtang/pcl,sbec/pcl,drmateo/pcl,LZRS/pcl,KevenRing/vlp,krips89/pcl_newfeatures,kanster/pcl,shivmalhotra/pcl,DaikiMaekawa/pcl,zhangxaochen/pcl,RufaelDev/pcc-mp3dg,lydhr/pcl,fanxiaochen/mypcltest,Tabjones/pcl,shyamalschandra/pcl,starius/pcl,drmateo/pcl,RufaelDev/pcc-mp3dg,DaikiMaekawa/pcl,fanxiaochen/mypcltest,lydhr/pcl,shangwuhencc/pcl,wgapl/pcl,KevenRing/vlp,locnx1984/pcl,RufaelDev/pcc-mp3dg,soulsheng/pcl,chenxingzhe/pcl,shangwuhencc/pcl,the-glu/pcl,KevenRing/pcl,damienjadeduff/pcl,stfuchs/pcl,krips89/pcl_newfeatures,cascheberg/pcl,kanster/pcl,shyamalschandra/pcl,ipa-rmb/pcl,cascheberg/pcl,shivmalhotra/pcl,pkuhto/pcl,mschoeler/pcl,drmateo/pcl,MMiknis/pcl,fskuka/pcl,closerbibi/pcl,simonleonard/pcl,wgapl/pcl,3dtof/pcl,lebronzhang/pcl,mikhail-matrosov/pcl,closerbibi/pcl,stfuchs/pcl,drmateo/pcl,3dtof/pcl,sbec/pcl,ResByte/pcl,DaikiMaekawa/pcl,nikste/pcl,stefanbuettner/pcl,starius/pcl,damienjadeduff/pcl,pkuhto/pcl,RufaelDev/pcc-mp3dg,drmateo/pcl,shivmalhotra/pcl,lebronzhang/pcl,mschoeler/pcl,KevenRing/vlp,MMiknis/pcl,MMiknis/pcl,damienjadeduff/pcl,fskuka/pcl,closerbibi/pcl,locnx1984/pcl,zhangxaochen/pcl,KevenRing/pcl,MMiknis/pcl,closerbibi/pcl,starius/pcl,soulsheng/pcl,shyamalschandra/pcl,cascheberg/pcl,ipa-rmb/pcl,closerbibi/pcl,pkuhto/pcl,Tabjones/pcl,raydtang/pcl,fskuka/pcl,chenxingzhe/pcl,simonleonard/pcl,LZRS/pcl,KevenRing/vlp,raydtang/pcl,fskuka/pcl,simonleonard/pcl,3dtof/pcl,Tabjones/pcl,Tabjones/pcl,nikste/pcl,krips89/pcl_newfeatures,stfuchs/pcl,fanxiaochen/mypcltest,lydhr/pcl,DaikiMaekawa/pcl,fanxiaochen/mypcltest,ipa-rmb/pcl,zhangxaochen/pcl,pkuhto/pcl,simonleonard/pcl,ResByte/pcl,shivmalhotra/pcl,sbec/pcl,lebronzhang/pcl,stefanbuettner/pcl,DaikiMaekawa/pcl,wgapl/pcl,shangwuhencc/pcl,stefanbuettner/pcl,lebronzhang/pcl,mschoeler/pcl,krips89/pcl_newfeatures,cascheberg/pcl,mschoeler/pcl,chenxingzhe/pcl,shyamalschandra/pcl,Tabjones/pcl,ResByte/pcl,krips89/pcl_newfeatures,lydhr/pcl,stefanbuettner/pcl,mikhail-matrosov/pcl,wgapl/pcl,kanster/pcl,the-glu/pcl,mikhail-matrosov/pcl,chenxingzhe/pcl,KevenRing/pcl,3dtof/pcl,simonleonard/pcl,fanxiaochen/mypcltest,lebronzhang/pcl,raydtang/pcl,locnx1984/pcl,locnx1984/pcl,starius/pcl,LZRS/pcl,zhangxaochen/pcl,nikste/pcl,starius/pcl,KevenRing/pcl,locnx1984/pcl,mikhail-matrosov/pcl,mikhail-matrosov/pcl,the-glu/pcl,soulsheng/pcl,the-glu/pcl