build-python-build.sh  and setuptools 60.5.0

on Ubuntu 20.04,  setuptools 60.5.0 causes dynamically loaded libraries to fail (and therefore things like "import math" during build to fail).

The temporary workaround is to invoke the python build as:
```SETUPTOOLS_USE_DISTUTILS=stdlib make -j```

which I needed to do in build-python-build.sh

I suppose this is just a place / way to log this until the setuptools fix is released...