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

[Joseph Myers]

On Tue, 14 Aug 2018, Zack Weinberg wrote:

> Let me ask you: how many other packages (besides glibc) in the
> bootstrap depend on Perl?  Is it within our reach, perhaps, to
> *replace* Perl with Python?

We can't even replace it for building the glibc manual (makeinfo is 
written in Perl).  What we can do is eliminate it as a *direct* dependency 
in glibc (so reducing the number of languages we need to deal with as 
glibc developers and the number of build-dependencies we need to 
document).

-- 
Joseph S. Myers
joseph@codesourcery.com