##### SUMMARY
Support become unprivileged user on macOS without `allow_world_readable_tmpfiles=true`

##### ISSUE TYPE
- Feature Idea

##### COMPONENT NAME
action, shell, and copy

##### ADDITIONAL INFORMATION
When using become where the login user and the become user are both unprivileged, Ansible attempts to securely change file permissions to only allow the become user to read the files. It uses `setfacl` and falls back to `chown`. Both of these fail on macOS, as there is no `setfacl` command and `chown` is not permitted.

macOS actually does provide the same functionality as `setfacl`, using `chmod +a`. The syntax is a bit different from `setfacl`, but it should be able to do what Ansible needs.
'''
        Copies the module data out to the temporary module path.
        '''
        if isinstance(data, dict):
            data = jsonify(data)
        afd, afile = tempfile.mkstemp(dir=C.DEFAULT_LOCAL_TMP)
        afo = os.fdopen(afd, 'wb')
        try:
            data = to_bytes(data, errors='surrogate_or_strict')
            afo.write(data)
        except Exception as e:
            raise AnsibleError("failure writing module data to temporary file for transfer: %s" % to_native(e))
        afo.flush()
        afo.close()
        try:
            self._transfer_file(afile, remote_path)
        finally:
            os.unlink(afile)
        return remote_path
    def _fixup_perms2(self, remote_paths, remote_user=None, execute=True):