[issue36346] Prepare for removing the legacy Unicode C API

[Stefan Behnel]

Stefan Behnel <stefan_ml at behnel.de> added the comment:

I think this is a good preparation that makes it clear what code will eventually be removed, and allows testing without it.

No idea how happy Windows users will be about all of this, but I consider it quite an overall improvement for the Unicode implementation. Once this gets removed, that is.

Removing the "unicode_internal" codec entirely (which is changed by this PR) is discussed in issue36297.

----------

_______________________________________
Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue36346>
_______________________________________