python37, python2: remove win64 workaround to fix aarch64-darwin

The issue manifests itself as the following on `aarch64-darwin`:

```
>>> import ctypes
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/nix/store/i8cq0xrjirz1rcp65wzcyhj6ypzlw9il-python3-3.7.10/lib/python3.7/ctypes/__init__.py", line 551, in <module>
    _reset_cache()
  File "/nix/store/i8cq0xrjirz1rcp65wzcyhj6ypzlw9il-python3-3.7.10/lib/python3.7/ctypes/__init__.py", line 273, in _reset_cache
    CFUNCTYPE(c_int)(lambda: None)
MemoryError
```

The commit we backport is included in Python 3.8, and it reverts
the change that was introduced all the way back in Python 2.7.

pkgs/development/interpreters/python/cpython/2.7/default.nix

@@ -106,6 +106,12 @@ let
 
       ./CVE-2021-3177.patch
 
+      # The workaround is for unittests on Win64, which we don't support.
+      # It does break aarch64-darwin, which we do support. See:
+      # * https://bugs.python.org/issue35523
+      # * https://github.com/python/cpython/commit/e6b247c8e524
+      ../3.7/no-win64-workaround.patch
+
     ] ++ optionals (x11Support && stdenv.isDarwin) [
       ./use-correct-tcl-tk-on-darwin.patch
     ] ++ optionals stdenv.isLinux [