Use -X frozen_modules=off in the test

Author: vstinner

Lib/test/test_cmd_line.py

@@ -1318,7 +1318,10 @@ def test_dump_path_config(self):
         # gh-151253: At the first import (import encodings) during Python
         # startup, if the import fails, dump the Python path configuration.
         nonexistent = '/nonexistent-python-path'
-        proc = assert_python_failure("-c", "pass", PYTHONHOME=nonexistent)
+        # Use -X frozen_modules=off to disable frozen encodings module
+        # on release build.
+        cmd = ["-X", "frozen_modules=off", "-c", "pass"]
+        proc = assert_python_failure(*cmd, PYTHONHOME=nonexistent)
         self.assertIn(b'Python path configuration:', proc.err)
         self.assertIn(f"PYTHONHOME = '{nonexistent}'".encode(), proc.err)