[tlbuild] asymptote 2.87 rebuild

[Robert Alessi]

On Wed, Feb 28, 2024 at 03:14:23PM -0700, Karl Berry wrote:
>     warning [version]: using possibly incompatible version 2.85 of plain.asy
> 
> Thanks Robert. I haven't updated the runtime yet. Shortly.
> I guess I'll try to make an x86_64-linux binary myself.
> 
> Meanwhile, John just sent me a tiny patch to picture.cc (committed),

:) I just ran this latest version to perfection.