[tools] use PYTHONUSERBASE in extras/install_sequitur.sh (kaldi-asr#3948)

Author: jtrmal

tools/extras/install_sequitur.sh

@@ -105,7 +105,7 @@ echo >&2 "SEQUITUR_PACKAGE: ${site_packages_dir:-}"
 echo >&2 "SEQUITUR: $SEQUITUR"
 echo >&2 "PYTHONPATH: ${PYTHONPATH:-}"
 mkdir -p $SEQUITUR
-PYTHONPATH=${PYTHONPATH:-}:$SEQUITUR python setup.py install --prefix `pwd`
+PYTHONPATH=${PYTHONPATH:-}:$SEQUITUR PYTHONUSERBASE=$(pwd) python setup.py install --user --prefix=
 ) || {
   echo >&2 "Problem installing sequitur!"
   exit 1