Add csc requirements to docs/building.md
Add csc requirements to docs/building.md
PFCKrutonium/libvideo,jamesqo/libvideo,James-Ko/libvideo,shads196770/libvideo,i3arnon/libvideo,PFCKrutonium/libvideo,nguyenkien/libvideo,nguyenkien/libvideo,shads196770/libvideo,James-Ko/libvideo,AIBrain/libvideo,AIBrain/libvideo,jamesqo/libvideo