[tlbuild] luatex build breaks in current TL

[Akira Kakuto]

Hi Norbert,

> there are more breakages in TL since the inclusion of the current luatex
> sources (did anyone did test builds before committing???)
>
> Travis-CI complains since the last commits, error excerpt:

Probably because reautoconf is not done yet.

Thanks,
Akira