bug#29040: emacs-26 crash due to misaligned longjmp buffer in 64-bit MSYS2/MinGW-W64 build

[Eli Zaretskii]

> From: Richard Copley <rcopley@gmail.com>
> Date: Sat, 28 Oct 2017 14:40:41 +0100
> 
> In the help-gnu-emacs thread, Eli said:
> 
>   [...] we should ask the MinGW64 developers for advice about using
>   longjmp. Most probably, something in that area has changed in recent
>   releases of their runtime [...]
> 
> Eli, my apologies, but I don't think I understand the issues well
> enough to have a productive discussion with the MinGW-W64 developers
> myself.

Just ask them to read this bug report and ask questions if they don't
understand the issue well enough.

Thanks.