Use gen-libm-test.py to generate ulps table for manual

[Andreas Schwab]

On Aug 09 2018, Joseph Myers <joseph@codesourcery.com> wrote:

> patch.)  Note that this introduces a Python dependency for building
> the manual, which is thus noted in install.texi and NEWS.

This would add python to the bootstrap cycle which is a big problem.

Andreas.

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Andreas Schwab, SUSE Labs, schwab@suse.de
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