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

[Kelley Cook]

--- Zack Weinberg <zack@codesourcery.com> wrote:

> Kelley Cook <kcook@gcc.gnu.org> writes:
> 
>> In July a patch was added to the Cygwin's toplevel that turns off
>> newlib if winsup isn't also present.
> 
> Hang on, is this even the right thing?  Aren't there embedded targets
> that use newlib but not winsup?

Sure there are.

But this hunk of configure code only applied to target *-*-cygwin*,
which will not build newlib without winsup.

See http://gcc.gnu.org/ml/gcc-patches/2004-06/msg01388.html for when
this was added.

KC

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