bug#53136: 28.0.90; segfault in lock_file

[Eli Zaretskii]

> Date: Mon, 10 Jan 2022 15:11:04 -0800
> Cc: 53136@debbugs.gnu.org, Po Lu <luangruo@yahoo.com>
> From: Paul Eggert <eggert@cs.ucla.edu>
> 
> 3. More importantly, I'm sure there are other places where Emacs assumes 
> that errno values are positive. I doubt whether it's reasonable to 
> expect Emacs developers to remember and work around this Haiku 
> incompatibility, every time they call a function that sets errno or 
> returns an errno value. Instead, we should arrange for Haiku builds to 
> use positive errno values, they way errno behaves on GNU and other 
> POSIX-compatible hosts. This should be a much more maintainable solution.

I agree.