Track down why pylint_django cannot be installed from a tarball

[carlio]

As part of #287 I needed to remove the non-binary installation flag (see discussion here: #287 (comment))

As far as I can tell the problem comes from clikit not being installed - when running with --no-binary :all: the installation fails (see this CI job)

This will need to be tracked down to completely understand what is missing so we can restore our tarball install sanity check.