[tex4ht] %%~ expands to $TEXMFDIST

[Michal Hoftich]

Hi Karl,

> TL19, including this change, is currently being pretested --
> https://tug.org/texlive/pretest.html. If anyone has patches to be
> included, please let me know asap.

I've just installed TL19 pretest and it seems to work well. I was bit
worried about Lua 5.3, which has some backward incompatible changes,
but I haven't found anything wrong so far.

Best,
Michal