Revert "make the locale_flag fallback code work again (#375)" (#387)

This reverts commit 43f5df5bfa.

Lib/test/test_re.py

@@ -1400,8 +1400,6 @@ class ReTests(unittest.TestCase):
     def test_locale_flag(self):
         import locale
         enc = locale.getpreferredencoding(False)
-        bletter = None
-        bpat = b'A'
         # Search non-ASCII letter
         for i in range(128, 256):
             try:
@@ -1415,6 +1413,9 @@ class ReTests(unittest.TestCase):
                 break
             except (UnicodeError, TypeError):
                 pass
+        else:
+            bletter = None
+            bpat = b'A'
         # Bytes patterns
         pat = re.compile(bpat, re.LOCALE | re.IGNORECASE)
         if bletter: