[RFA]: Top-level configure patch to build Cygwin native newlib

[DJ Delorie]

> > It would be a good idea.  IIRC, most of the top-level files are 
> > copied by sources from gcc.  Did I get that correct, Chris?
>  
> That's correct,

No, it's not.  I or Nathanael *manually* sync the toplevel files in
*both* directions because neither side ever agreed to cede control to
the other.  I usually try to get the submitter to commit to both sides
to save us the work, though.