python-libraries: Force old build process

python-libraries: Force old build process

These packages will need adjustments to work with pyproject.toml-based
builds, so set PYTHON3_PKG_FORCE_DISTUTILS_SETUP:=1 to force the old
build process (when pyproject.toml-based builds are in place) for now.

Signed-off-by: Jeffery To <jeffery.to@gmail.com>
(cherry picked from commit e6ae9e29d59001a8c31781c1e2c32261f34c05be)