Fix compile for CUDA and VTK 6 for gpu_people module.
Fix compile for CUDA and VTK 6 for gpu_people module.

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