Simple patch that prevent the prefetch of the oauth token

closes odoo/odoo#177259

Signed-off-by: Rémy Voet (ryv) <ryv@odoo.com>

[14.0][FIX] auth_oauth: make token non-prefetch

Allow building a wheel or an sdist through the pep517
interface, taking care of the required pre-processing
to copy addons in odoo/addons.

Force the setuptools compat mode for editable installs.
This mode is the simplest, since it just installs a .pth
files which extends PYTHONPATH with the Odoo root directory.

[14.0][ADD] setup: pep518 support