bug#12450: Remove configure's --without-sync-input option.

[Paul Eggert]

On 09/15/2012 01:15 PM, Eli Zaretskii wrote:
> I tried your patches already, they compile, and the resulting binary
> seems to work.

Excellent!  Thanks for trying it out.

> what does that prove?

It doesn't *prove* anything -- there are no *proofs* of any
nontrivial Emacs code, to my knowledge -- but it's a good indication
that this change is benign for the Microsoft port.  That is what I'd
expect from my admittedly-limited understanding of the Microsoft port,
for reasons already discussed.

The change is a real win for the mainline code, so this is
a good sign.  Thanks again for checking it.