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

[Eli Zaretskii <eliz@gnu.org>]

Ping!  I'd like to fix this problem for Emacs 25.1, if possible.

> Date: Sat, 09 Apr 2016 10:53:02 +0300
> From: Eli Zaretskii <eliz@gnu.org>
> Cc: 23074@debbugs.gnu.org
> 
> > 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.
> 
> 
> 
>