bug#23074: 25.1.50; X11: `use-fancy-splash-screens-p` erroneously returns nil.

[Eli Zaretskii]

> Date:  Fri, 08 Apr 2016 23:48:13 -0700
> From:  Keith David Bershatsky <esq@lawlist.com>
> Cc:  23074@debbugs.gnu.org
> 
> In all four (4) cases tested this evening with the current emacs-25 branch 
> (April 8, 2016), the `splash.svg` image is used and it has the same 
> dimensions in all four situations tested:  (41.625 . 15.533333333333333).

Thanks.  This means the initial frame needs to be enlarged by one more
line.

However, I wonder whether this is what all OS X users see, or just
something specific to your system.  Can someone else please repeat
these experiments on OS X and report the results?  John?  Anyone?

Here's the recipe to be evaluated in *scratch* in "emacs -Q":

  (let* ((img (create-image (fancy-splash-image-file)))
         (image-height (and img (cdr (image-size img nil)))))
    (message "%s" image-height))

> I have not experimented with removing svg support while trying to maintain 
> support for other possible image types -- e.g., splash.pbm, splash.png or 
> splash.xpm.

I don't think this matters, all the images will have the same size.