Why does pgindent's README say to download typedefs.list from the buildfarm?

I used to do this step when I first started hacking on Postgres because
that's what it says to do, but I've only ever used the in-tree one for many
years now, and I'm not aware of any scenario where I might need to download
a new version from the buildfarm.  I see that the in-tree copy wasn't added
until 2010 (commit 1604057), so maybe this is just leftover from back then.

Could we remove this note now?

-- 
Nathan Bossart
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