[luatex] [MiKTeX] Calling texlua from texlua, with a space in the tex binary path

[Akira Kakuto]

Dear Siep Kroonenberg,

> So this has been observed before. As I already mentioned, MiKTeX does
> return the value set by setenv. So does Linux, as I just tested.

A difference may be that I'm using a dynamic library for lua52.
I think it may be possible that TL/w32 is right and MiKTeX and Linux are wrong.

Thanks,
Akira