[tex-live] vntex INSTALL file

[Karl Berry]

    With "export TTFONTS=/a/b/c" it returns "/a/b/c"  but with 
    "export TTFONTS=/a/b/c:" it returns an empty string.

I get the empty string even when TTFONTS is set, regardless of the extra :.

    tug$ export TTFONTS=/a/b/c; kpsewhich --expand-path '$TTFONTS'

    tug$

Olaf, can you look into this?  I don't see anything obvious in
tex-file.c, it seems to be getting treated the same as everything else.

Thanks,
Karl