If you build python/python3 and later decide to build
python(3)-setuptools and/or python(3)-pip, the build won't
re-run without adding `CONFIG_PACKAGE_python(3)-setuptools`
and `CONFIG_PACKAGE_python(3)-pip`.
Seems to resolve issue:
https://github.com/openwrt/packages/issues/4529
Signed-off-by: Alexandru Ardelean <ardeleanalex@gmail.com>