python/python3-constantly: Fix PYTHONPATH.

Signed-off-by: Willy Sudiarto Raharjo <willysr@slackbuilds.org>

python/python3-constantly/python3-constantly.SlackBuild

@@ -85,7 +85,8 @@ find -L . \
  \( -perm 666 -o -perm 664 -o -perm 640 -o -perm 600 -o -perm 444 \
   -o -perm 440 -o -perm 400 \) -exec chmod 644 {} \;
 
-export PYTHONPATH=/opt/python3.9/site-packages/
+PYVER=$(python3 -c 'import sys; print("%d.%d" % sys.version_info[:2])')
+export PYTHONPATH=/opt/python$PYVER/site-packages/
 python3 setup.py install --root=$PKG
 
 find $PKG -print0 | xargs -0 file | grep -e "executable" -e "shared object" | grep ELF \