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

[DJ Delorie]

> the problem here is that I don't have checkin permissions on the gcc
> repository.  I've applied the below patch now to the sourceware repository. 
> It would be nice if you could pick it up for gcc.

FYI you used an older version of autoconf to regenerate configure.
Please actually review the diffs when you regenerate files and make
sure you don't change more than you should.