Every time lib32-nvidia-utils updates in multilib, it breaks steam since nvidia and nvidia-utils does not update with it.
So that's why my Steam segfaulted. I've been wondering why.
We'll make sure lib32-nvidia-utils sync with nvidia and nvidia-utils, (since I don't maintain drivers it'll have to wait for a little bit), but for now you can use
# pacman -S extra/nvidia-dkms
as a workaround.
Thanks for adding the package! I haven't had any other issues with steam yet.