[pkg] Configure "universal" wheel build
According to https://packaging.python.org/distributing/#wheels,
we should create universal wheels (no 2to3 step, no C extension).
Configure this in setup.cfg.
[ci skip]
missing-dep-for-interpreter make => make | build-essential | dpkg-dev (usr/*/cubicweb/skeleton/debian/rules)
embedded-javascript-library usr/share/cubicweb/cubes/shared/data/jquery.js