pyzmq has a similar issue. I believe one solution would be to call
`_Py_ActivateActCtx` in ctypes' load_library, i.e. do
```
#if HAVE_SXS
        ULONG_PTR cookie = _Py_ActivateActCtx();
#endif
        hMod = LoadLibraryW(name);
#if HAVE_SXS
        _Py_DeactivateActCtx(cookie);
#endif
```
in that function. I don't know enough about python or ctypes to say whether this patch works as is (_Py_ActivateActCtx seems to be an internal function, not sure if ctypes has access to that).