It builds, but doesn't work yet, because it doesn't find any paths.
It seems like this requires some further patching, probably in mtxrun.lua,
which comes from texlive. Note that this doesn't use libkpathsea and therefore
doesn't use the already patched logic we have.
Notes about the recipe:
This contains an alternate download URL from TeXLive's SVN, used before when
the upstream GitHub didn't have this version yet. The official download from
the website is unversioned and contains the full ConTeXt distribution, which
makes it unsuitable for packaging.
