Revert "pythongh-95027: Fix regrtest stdout encoding on Windows (pyth…

…onGH-98492)"

This reverts commit b2aa28e.

Lib/test/libregrtest/runtest_mp.py

@@ -21,9 +21,6 @@
 from test.libregrtest.setup import setup_tests
 from test.libregrtest.utils import format_duration, print_warning
 
-if sys.platform == 'win32':
-    import locale
-
 
 # Display the running tests if nothing happened last N seconds
 PROGRESS_UPDATE = 30.0   # seconds
@@ -262,16 +259,11 @@ def _run_process(self, test_name: str, stdout_fh: TextIO) -> int:
             self.current_test_name = None
 
     def _runtest(self, test_name: str) -> MultiprocessResult:
-        if sys.platform == 'win32':
-            # gh-95027: When stdout is not a TTY, Python uses the ANSI code
-            # page for the sys.stdout encoding. If the main process runs in a
-            # terminal, sys.stdout uses WindowsConsoleIO with UTF-8 encoding.
-            encoding = locale.getencoding()
-        else:
-            encoding = sys.stdout.encoding
         # gh-94026: Write stdout+stderr to a tempfile as workaround for
         # non-blocking pipes on Emscripten with NodeJS.
-        with tempfile.TemporaryFile('w+', encoding=encoding) as stdout_fh:
+        with tempfile.TemporaryFile(
+            'w+', encoding=sys.stdout.encoding
+        ) as stdout_fh:
             # gh-93353: Check for leaked temporary files in the parent process,
             # since the deletion of temporary files can happen late during
             # Python finalization: too late for libregrtest.