Backport 55873:

Prevent these tests from running on Win64 since they don't apply there either

Lib/test/test_str.py

@@ -1,5 +1,6 @@
 
 import unittest
+import struct
 import sys
 from test import test_support, string_tests
 
@@ -88,7 +89,7 @@ class StrTest(
         # This test only affects 32-bit platforms because expandtabs can only take
         # an int as the max value, not a 64-bit C long.  If expandtabs is changed
         # to take a 64-bit long, this test should apply to all platforms.
-        if sys.maxint > (1 << 32):
+        if sys.maxint > (1 << 32) or struct.calcsize('P') != 4:
             return
         self.assertRaises(OverflowError, 't\tt\t'.expandtabs, sys.maxint)