bug#65206: 29.1; [windows][patch] build-deps-zips.py is broken and hard to maintain

[Eli Zaretskii]

> From: Corwin Brust <corwin@bru.st>
> Date: Thu, 17 Aug 2023 02:25:27 -0500
> Cc: 65206@debbugs.gnu.org
> 
> The attached patch replaces DLL_REQ (the var holding the "starting"
> list of DLLs) with an invocation of emacs batch, as described above.
> Once this patch is installed, the script will require the (path to
> the) nominally newly created Emacs binary as an argument.
> 
> I'm still looking at the differences between outputs from this and
> from the script as from my prior patch; however, this runs without
> error which will improve the situation if it is applied.  (The patch
> is for emacs-29 because I expect Emacs 29.2 will be the next release
> packaged.)

Hmm... what is the value of libjpeg-version?  It's 90 here, so the
library for JPEG is libjpeg-9.dll, not libjpeg-8.dll.

Otherwise, LGTM, thanks.