bug#6660: xassert failure on make custom-deps

[Eli Zaretskii]

> From: Juanma Barranquero <lekktu@gmail.com>
> Date: Sat, 17 Jul 2010 18:29:52 +0200
> Cc: 6660@debbugs.gnu.org
> 
> On Sat, Jul 17, 2010 at 17:30, Eli Zaretskii <eliz@gnu.org> wrote:
> 
> > How about turning it on by default in nt/configure.bat, when --no-opt
> > was specified?
> 
> I'm all for it, but it has a small, though non-negligible impact on
> performance. Are the official binary builds for Windows optimized or
> non-optimized?

I don't know.

Perhaps we should simply add another switch to configure.bat, like,
for example, --enable-checking.  That would keep everyone happy.