bug#39940: The variable operating-system-release

[Eli Zaretskii]

> From: Lars Ingebrigtsen <larsi@gnus.org>
> Cc: Eli Zaretskii <eliz@gnu.org>,  39940@debbugs.gnu.org
> Date: Sat, 30 Jan 2021 07:10:56 +0100
> 
> Glenn Morris <rgm@gnu.org> writes:
> 
> > A total of two short mails in the thread mention this variable.
> > The variable was used only in mac-win.el, which was removed in 2008.
> > Seems like a great candidate for obsolescence to me.
> 
> True.  I see that Eli added support for it on Windows too now, so I
> guess he disagrees.  :-)

I don't necessarily disagree, I just don't like a situation where some
platforms have that variable at the nil value, when a 5-line change
can fix that.  It was a surprise for me to discover the nil value on
Windows.  But those 5 lines aren't sacred to me, so if we decide to
deprecate the variable and eventually remove the supporting code, I
won't object.