fix: python bindings: use stdlib distutils when setuptools is installed

fix: python bindings: use stdlib distutils when setuptools is installed

When the setuptools package is installed, it monkey patches the standard
library distutils even if the user code doesn't import setuptools.

This results in a failure to install the Python agent in a directory
which isn't in the current PYTHONPATH. To allow this, setuptools requires
the '--single-version-externally-managed' options which is not
implemented in distutils.

To resolve this, force the use of distutils for Python < 3.12 even when
setuptools is installed with the 'SETUPTOOLS_USE_DISTUTILS' environment
variable and use the previously mentionned setuptools option with Python
>= 3.12 which doesn't include distutils anymore.

Change-Id: I9e8412021c6ec79b0a9ea38759c475113e4ea018
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Reviewed-on: https://review.lttng.org/c/babeltrace/+/10371
Tested-by: jenkins <jenkins@lttng.org>
Reviewed-by: Philippe Proulx <eeppeliteloop@gmail.com>