bring us up to date. Switch over to using MODPY_SETUPTOOLS and
MODPY_PYTEST which removes the need for py-nose in TEST_DEPENDS.
Drop the unnecessary MODPY_FLAVOR off of py-pathlib since that is
in a conditional for Python 3 only.
Moving to MODPY_SETUPTOOLS requires patching setup.py to use
setuptools rather than the obsolete distutils.
OK sthen
aaacf4ec0f