Make CVE-2020-10735 allowlist entries Windows-only (#10318)

Author: AlexWaygood

tests/stubtest_allowlists/py3_common.txt

@@ -609,11 +609,6 @@ typing.IO.__iter__  # See https://github.com/python/typeshed/commit/97bc450acd60
 # so stubtest will sometimes complain about exported names being different at runtime to the exported names in the stub
 (locale.__all__)?
 
-# Added in a patch release, backported to all security branches,
-# but have yet to find their way to all GitHub Actions images
-(sys.get_int_max_str_digits)?
-(sys.set_int_max_str_digits)?
-
 # Added or modified in a patch release, backported to all security branches,
 # but have yet to find their way to all GitHub Actions images
 (tarfile.tar_filter)?

tests/stubtest_allowlists/win32.txt

@@ -66,3 +66,8 @@ tty
 # pathlib functions that rely on modules that don't exist on Windows
 pathlib.Path.owner
 pathlib.Path.group
+
+# Added in a patch release, backported to all security branches,
+# but have yet to find their way to all GitHub Actions images
+(sys.get_int_max_str_digits)?
+(sys.set_int_max_str_digits)?