Don't use -Wno-error=undef

[Mike Frysinger]

On 18 Aug 2015 22:59, Andreas Schwab wrote:
> The glibc project is about cooperation, not pulling the trigger.

yes, but this patch isn't really any different i don't think than patches
that touch common code.  we don't require every contributor to run every
patch through every single supported config.  most test one or two only.
-mike
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