PLEASE FIX NOW! make check-abi exits zero on failure

[Roland McGrath]

> On 03/17/2014 06:50 PM, Roland McGrath wrote:
> > Whatever changes whoever made need to be fixed or reverted right away.
> > 'make check-abi' exits with status zero when there are failures.
> > This is unacceptable.
> > 
> > If the people who broke this don't fix this it quickly, I'll start randomly
> > reverting changes that look related.
> 
> Not for me?
> 
> [carlos@koi glibc-wundef]$ make -k check

Using a target other than the one I said is broken indeed does not
demonstrate the brokenness.