[toplevel, Cygwin] Don't warn if both newlib and winsup are missing

[DJ Delorie]

> 2004-10-12  Kelley Cook  <kcook@gcc.gnu.org>
> 
> 	* configure.in (*-*-cygwin*): Supress warning when newlib not present.
> 	* configure: Regenerate.

This is OK.

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