bug#18438: 24.4.50; assertion failed in bidi.c

[Eli Zaretskii]

> Date: Sat, 11 Oct 2014 12:33:29 -0400
> From: Ken Brown <kbrown@cornell.edu>
> CC: aidalgol@amuri.net, 18438@debbugs.gnu.org
> 
> I'm inclined to go ahead and patch configure.ac to do the same on 
> Cygwin, whether it turns out to fix this bug or not.  After all, we 
> already know from the August 2013 discussion that the default Cygwin 
> stack is not big enough.  What do you think?

I think go ahead and do it.  The result should be tested with as many
additional threads as possible, because each thread eats some of the
stack space.