[Groff] temporary files with -Thtml

[Bernd Warken]

grohtml does not clean-up some temporary files. For example, try

cd <some_temp_dir>
echo test | GROFF_TMPDIR=. groff -Thtml >/dev/null
ls -l groff-*

This will display something like

-rw-------    1 bernd    users           0 Jun 17 18:45 groff-page-m9NMMr
-rw-------    1 bernd    users           0 Jun 17 18:45 groff-ps-n9N6Yi
-rw-------    1 bernd    users        3313 Jun 17 18:45 groff-ps-z2iUAA
-rw-------    1 bernd    users           0 Jun 17 18:45 groff-regions-mQNnpJ

So 4 temporary files were not deleted.  Oher devices seem to do their 
clean-up.

Bernd Warken