bug#58318: 28.2; Emacs installed from package won't work with MinGW

[Eli Zaretskii]

> From: Corwin Brust <corwin@bru.st>
> Date: Fri, 7 Oct 2022 10:34:38 -0500
> Cc: Andrea Corallo <akrl@sdf.org>, larsi@gnus.org, bartosz.bubak@gmail.com, 
>       58318@debbugs.gnu.org
> 
> FWIW, It appeared to take around 12 minutes to build all trampolines
> starting from the "installed" Emacs that was the source for the 28.2
> binary zips.

Is that serially, i.e. using a single Emacs process at a time?