Worth noting that this does NOT currently build, thanks to a few lines in libass that are not compatible with vc++. I'll bump the libass commit when MrSmile's pr gets merged and this is remedied. You can apply this commit to remedy that: 5317a8dd89
Also worth noting that while libass switched to nasm, I haven't done so here because it wasn't worth the effort, so I just made a questionable change to the yasm.targets to emulate nasm behavior
