scripts.utils: remove builtins

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@71435 15284696-431f-4ddb-bdfa-cd5b030d7da7

lib/python/script/utils.py

@@ -26,10 +26,7 @@ import shlex
 import re
 
 
-try:
-    from builtins import unicode
-except ImportError:
-    # python3
+if sys.version_info.major == 3:
     unicode = str