Update prerequisites in building.md
Update prerequisites in building.md
jamesqo/libvideo,shads196770/libvideo,PFCKrutonium/libvideo,James-Ko/libvideo,nguyenkien/libvideo,PFCKrutonium/libvideo,James-Ko/libvideo,AIBrain/libvideo,shads196770/libvideo,jamesqo/libvideo,nguyenkien/libvideo,i3arnon/libvideo,AIBrain/libvideo