...that has been disabled and hidden ever since
4c90ed78 "Actually hide these two radio buttons
(since there is no choice now)."

This removes the sole user of SvScriptStream.  (Unfortunately, removing the no
longer needed

  #include <osl/process.h>

from include/tools/stream.hxx triggered an avalanche of missing includes
elsewhere.)

Change-Id: I7b0e683b14c0eaf7f4737f62adc9d691826380c0
Reviewed-on: https://gerrit.libreoffice.org/42916Reviewed-by: Michael Meeks <michael.meeks@collabora.com>
Tested-by: Michael Meeks <michael.meeks@collabora.com>