[luatex] MWE now failing with recent TeX Live update

[Javier Bezos]

Ulrike,

> (But imho it would be better to pack this base code in some
> standalone file.

Not a bad idea. I'll see how to do it. Actually, this is the
idea behind the 'base' option (one of them), but since it seems
to be under suspicion...

 > Part of it could probably also go in the format.

The less in the format, the better. And there are also formats
not based on language.dat, but on language.def, so the code
should be repeated.

Javier