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

[Eli Zaretskii]

> Date:  Sat, 26 Mar 2016 21:04:27 -0700
> From:  Keith David Bershatsky <esq@lawlist.com>
> Cc:  23074@debbugs.gnu.org
> 
> Here are four (4) X11 configuration options (built on an OSX box) and 
> corresponding frame-height values.
> 
> None of the four (4) options tested display the Emacs logo splash image.
> 
> 
> Emacs 25:  --with-x [no toolkit configuration] = the default is `gtk3`
>   (frame-height) = 36
> 
> Emacs 25:  --with-x --with-x-toolkit=athena
>   (frame-height) = 35
> 
> Emacs 25:  --with-x --with-x-toolkit=motif
>   (frame-height) = 35
> 
> Emacs 25:  --with-x --with-x-toolkit=no
>   (frame-height) = 36

Please also tell what does image-size return for the splash image in
each case.

Thanks.