Merge pull request #4330 from python-poetry/fix-system-env-detection-1.1

[1.1] Fix system environment detection

poetry/utils/env.py

@@ -753,7 +753,7 @@ def create_venv(
                     "</>"
                 )
 
-                return SystemEnv(Path(sys.prefix))
+                return self.get_system_env()
 
             io.write_line(
                 "Creating virtualenv <c1>{}</> in {}".format(name, str(venv_path))