build.sh: setup number of jobs according to number of available cores
build.sh: setup number of jobs according to number of available cores


zzhhui/webrtc-jingle-client,fishwenHub/webrtc-jingle-client,fishwenHub/webrtc-jingle-client,fishwenHub/webrtc-jingle-client,juxiangjun/webrtc-jingle-client,lukeweber/webrtc-jingle-client,tempbottle/webrtc-jingle-client,fishwenHub/webrtc-jingle-client,juxiangjun/webrtc-jingle-client,lukeweber/webrtc-jingle-client,zzhhui/webrtc-jingle-client,juxiangjun/webrtc-jingle-client,tempbottle/webrtc-jingle-client,juxiangjun/webrtc-jingle-client,lukeweber/webrtc-jingle-client,lukeweber/webrtc-jingle-client,zzhhui/webrtc-jingle-client,zzhhui/webrtc-jingle-client,tempbottle/webrtc-jingle-client,juxiangjun/webrtc-jingle-client,zzhhui/webrtc-jingle-client,tempbottle/webrtc-jingle-client,tempbottle/webrtc-jingle-client,fishwenHub/webrtc-jingle-client,lukeweber/webrtc-jingle-client