Fix for issue #506
Fix for issue #506

Quit earlier if libusb-1.0 is not found to prevent OPENNI_FOUND from being set



git-svn-id: 5398946ba177a3e438c2dae55e2cdfc2fb96c905@4036 a9d63959-f2ad-4865-b262-bf0e56cfafb6

KevenRing/pcl,fskuka/pcl,simonleonard/pcl,shangwuhencc/pcl,fanxiaochen/mypcltest,kanster/pcl,cascheberg/pcl,nikste/pcl,ipa-rmb/pcl,sbec/pcl,shivmalhotra/pcl,raydtang/pcl,ResByte/pcl,chenxingzhe/pcl,DaikiMaekawa/pcl,zavataafnan/pcl-truck,cascheberg/pcl,RufaelDev/pcc-mp3dg,pkuhto/pcl,sbec/pcl,zavataafnan/pcl-truck,nh2/pcl,jeppewalther/kinfu_segmentation,msalvato/pcl_kinfu_highres,shyamalschandra/pcl,KevenRing/vlp,locnx1984/pcl,v4hn/pcl,sbec/pcl,3dtof/pcl,fanxiaochen/mypcltest,simonleonard/pcl,wgapl/pcl,sbec/pcl,kanster/pcl,KevenRing/pcl,srbhprajapati/pcl,ResByte/pcl,zavataafnan/pcl-truck,chatchavan/pcl,lydhr/pcl,chatchavan/pcl,locnx1984/pcl,raydtang/pcl,3dtof/pcl,RufaelDev/pcc-mp3dg,lebronzhang/pcl,soulsheng/pcl,Nerei/pcl_old_repo,msalvato/pcl_kinfu_highres,krips89/pcl_newfeatures,shivmalhotra/pcl,stfuchs/pcl,fskuka/pcl,Nerei/pcl_old_repo,stfuchs/pcl,srbhprajapati/pcl,stefanbuettner/pcl,MMiknis/pcl,jeppewalther/kinfu_segmentation,shyamalschandra/pcl,KevenRing/vlp,stfuchs/pcl,lebronzhang/pcl,drmateo/pcl,starius/pcl,KevenRing/pcl,shangwuhencc/pcl,nikste/pcl,fskuka/pcl,shangwuhencc/pcl,lebronzhang/pcl,shivmalhotra/pcl,RufaelDev/pcc-mp3dg,lydhr/pcl,starius/pcl,KevenRing/pcl,ipa-rmb/pcl,jakobwilm/pcl,zhangxaochen/pcl,ResByte/pcl,msalvato/pcl_kinfu_highres,shyamalschandra/pcl,shyamalschandra/pcl,cascheberg/pcl,stefanbuettner/pcl,krips89/pcl_newfeatures,3dtof/pcl,ipa-rmb/pcl,KevenRing/vlp,RufaelDev/pcc-mp3dg,fanxiaochen/mypcltest,the-glu/pcl,stefanbuettner/pcl,krips89/pcl_newfeatures,shivmalhotra/pcl,Tabjones/pcl,starius/pcl,chenxingzhe/pcl,mschoeler/pcl,mikhail-matrosov/pcl,DaikiMaekawa/pcl,jakobwilm/pcl,v4hn/pcl,nh2/pcl,v4hn/pcl,cascheberg/pcl,zhangxaochen/pcl,mikhail-matrosov/pcl,kanster/pcl,jakobwilm/pcl,kanster/pcl,stfuchs/pcl,zhangxaochen/pcl,simonleonard/pcl,mikhail-matrosov/pcl,MMiknis/pcl,raydtang/pcl,jeppewalther/kinfu_segmentation,Nerei/pcl_old_repo,LZRS/pcl,cascheberg/pcl,chenxingzhe/pcl,DaikiMaekawa/pcl,chenxingzhe/pcl,closerbibi/pcl,lydhr/pcl,zavataafnan/pcl-truck,fskuka/pcl,the-glu/pcl,lebronzhang/pcl,nikste/pcl,v4hn/pcl,lydhr/pcl,lydhr/pcl,soulsheng/pcl,shangwuhencc/pcl,Tabjones/pcl,pkuhto/pcl,msalvato/pcl_kinfu_highres,drmateo/pcl,LZRS/pcl,damienjadeduff/pcl,jeppewalther/kinfu_segmentation,closerbibi/pcl,ipa-rmb/pcl,pkuhto/pcl,drmateo/pcl,closerbibi/pcl,pkuhto/pcl,chatchavan/pcl,sbec/pcl,3dtof/pcl,RufaelDev/pcc-mp3dg,krips89/pcl_newfeatures,wgapl/pcl,v4hn/pcl,locnx1984/pcl,kanster/pcl,zhangxaochen/pcl,the-glu/pcl,wgapl/pcl,chenxingzhe/pcl,krips89/pcl_newfeatures,KevenRing/vlp,jakobwilm/pcl,simonleonard/pcl,MMiknis/pcl,Tabjones/pcl,srbhprajapati/pcl,nikste/pcl,KevenRing/vlp,raydtang/pcl,damienjadeduff/pcl,soulsheng/pcl,ipa-rmb/pcl,closerbibi/pcl,mschoeler/pcl,lebronzhang/pcl,simonleonard/pcl,locnx1984/pcl,jeppewalther/kinfu_segmentation,drmateo/pcl,closerbibi/pcl,stefanbuettner/pcl,shyamalschandra/pcl,KevenRing/pcl,MMiknis/pcl,Tabjones/pcl,soulsheng/pcl,damienjadeduff/pcl,ResByte/pcl,starius/pcl,nh2/pcl,LZRS/pcl,mschoeler/pcl,stefanbuettner/pcl,damienjadeduff/pcl,LZRS/pcl,the-glu/pcl,fanxiaochen/mypcltest,MMiknis/pcl,shangwuhencc/pcl,starius/pcl,DaikiMaekawa/pcl,drmateo/pcl,chatchavan/pcl,zhangxaochen/pcl,3dtof/pcl,locnx1984/pcl,mikhail-matrosov/pcl,shivmalhotra/pcl,DaikiMaekawa/pcl,ResByte/pcl,mikhail-matrosov/pcl,nh2/pcl,msalvato/pcl_kinfu_highres,mschoeler/pcl,soulsheng/pcl,srbhprajapati/pcl,damienjadeduff/pcl,Tabjones/pcl,the-glu/pcl,zavataafnan/pcl-truck,fanxiaochen/mypcltest,raydtang/pcl,Nerei/pcl_old_repo,stfuchs/pcl,srbhprajapati/pcl,wgapl/pcl,pkuhto/pcl,wgapl/pcl,nikste/pcl,mschoeler/pcl,jakobwilm/pcl,fskuka/pcl,LZRS/pcl