bug#18347: 24.3.93; Incomplete splash screen display on Cygwin-w32 build

[Ken Brown]

Version: 24.3.94

> Basically, since creating a frame on w32 takes some time until the OS
> sets up the message pump for the new frame, Lisp code that creates a
> frame and immediately proceeds with manipulating the new frame might
> sometimes need sit-for to let the dust settle.

So it seems that the current bug probably has the same cause as 
bug#16014.  I've installed the fix (but using the window-system 
function) in the release branch as bzr revision 117465.

Ken