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

[Zack Weinberg]

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?

zw

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