fix -Werror regressions with gcc 4.8 on x86_64

[Andreas Schwab]

Chris Metcalf <cmetcalf@ezchip.com> writes:

> NDEBUG is added by default to RedHat/Fedora builds (other than prereleases).
> This has been true since 2009; Andreas can perhaps comment on this, since the
> changelog shows he enabled it.

The fedora glibc has always been built with NDEBUG.  My change was to
disable it for glibc pre-releases, for better test coverage.

Andreas.

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Andreas Schwab, schwab@linux-m68k.org
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