[tex-live] wrong path in tex4ht.env

[Akira Kakuto]

Dear Matthias,

> Changing the paths to texlive/2013 did the job. The Unix-File does not 
> use absolute paths but %%~ for ${SELFAUTOPARENT} of KPATHSEA. Is 
> something equivalent possible on windows?

%%~ should also work on windows. Changed in r31548.
Many thanks for the report.

Thanks,
Akira