Alp Mestanogullari authored Feb 27, 2019 and Marge Bot committed Mar 01, 2019

The initial motivation for this is to have a chance to run the binary
distribution rules in our Windows CI without having to install
sphinx-build and xelatex there, while retaining the ability to
generate haddocks. I just ended up extending this idea a little bit so
as to have control over whether we build haddocks, (sphinx) HTML manuals,
(sphinx) PDF manuals and (sphinx) manpages.