[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.

If you need values of variables setenved in the current
process, please initialize kpse and use kpse.var_value().
FYI, os.getenv() is defined in the lua52.dll and os.setenv()
is defined in the texlua.

Thanks,
Akira