Cleaning site-packages directory

[tito]

The site-packages installed on the device contains files that could be safely removed.

• all the dist-info directories
• .so.libs

And to remove safely all the py files, we need to:

• cd dist/root/python3
• cp -a lib lib.old
• ../../hostpython3/bin/python -m compileall -b lib
• find lib -regex '.*\.py$' | xargs rm
• find lib -iname __pycache__ | xargs rm -rf

IMO, this should be done after any pip install, or recipe installation

[Zen-CODE]

@tito There does not appear to be a dist/root/python3 folder anymore, so the comment may be outdated. Would this be equivalent to dist/hostpython3/lib/python3.8/site-packages in the latest builds? And for that matter, would it not also apply to the parent dist/hostpython3/lib/python3.8 as well?