Revert "bpo-29571: Use correct locale encoding in test_re (#149)" (#554)

This reverts commit ace5c0f.

Author: benjaminp

Lib/test/test_re.py

@@ -1334,7 +1334,7 @@ def test_ascii_and_unicode_flag(self):
 
     def test_locale_flag(self):
         import locale
-        enc = locale.getpreferredencoding(False)
+        _, enc = locale.getlocale(locale.LC_CTYPE)
         # Search non-ASCII letter
         for i in range(128, 256):
             try: