Emacs 28 pretest MS Windows snapshots

[Drew Adams]

I downloaded emacs-28.0.50-snapshot-2020-06-26-x86_64-no-deps.zip from 
https://alpha.gnu.org/gnu/emacs/pretest/windows/emacs-28/, thinking it would be 
usable with the usual image-handling dlls I've had for years.

Nope.  Missing libgmp-10.dll.

Is it normal that now the choices are either (1) get the complete, additional 
50M snapshot or (2) have to install dlls such as this separately?  It used to 
be possible to just have separate support for PNG, JPG, etc.

Also, the README-windows-binaries in the same directory says this:

 In addition, we provide the following files which will
 not be useful for most end-users.

 emacs-$VERSION-x86_64-deps.zip

 The dependencies. Unzipping this file on top of
 emacs-$VERSION-x86_64-no-deps.zip should result in the same install as
 emacs-$VERSION-x86_64.zip.

I see no such *-deps.zip file.  So I guess I need to download the full sack now.

The README-* file also has hard-coded "emacs-27" in place of emacs-$VERSION in 
two places.