bug#67540: 29.1; Emacs on Windows incorrectly capitalizes some environment variables

[Eli Zaretskii]

> From: Dave Abrahams <dave@boostpro.com>
> Date: Fri, 1 Dec 2023 12:34:40 -0800
> Cc: jporterbugs@gmail.com, 67540@debbugs.gnu.org
> 
> You’re saying that these are ported UNIX programs that are only designed to 
> work from inside of Emma, which has changed the spelling of the environment 
> variable names?

No, they are not for Emacs only.  But they expect to see PATH, and
they compare case-sensitively with "PATH".  If you want to cater to
swift, which doesn't recognize "PATH", but does recognize "Path", why
not assume that there are other programs which do the opposite, and
which will be broken by the change you propose?

IOW, I don't see why we should change code that worked for decades
because a single application implements a case-sensitive search of
environment variables on MS-Windows, in direct contradiction of
platform conventions, and contrary to the behavior of every other
program I've ever used on Windows?