[lltx] kpse and texlua

[Arthur Reutenauer]

> I don't know what to make with the output :) you can just try increasing
> the long level until you find something useful.

  Not sure if it helps, but I just had the same kind of problems as Élie
on my machine, and I can make the script work if I tweak with
TEXINPUTS (by manually naming the repositories where the Lua files
reside).  I expected setting LUAINPUTS would help here, but it doesn't.

	Arthur