tests: further relax the number of files check in test-check-sdist.t A previous patch bumped this number due to a different version of setuptools or distutils or some other package that we don't control, which made it pretty obvious that this check is not really practical. We need a better way to check that all needed files are present in the tarball. I have some ideas, but this patch can be applied without further waiting, and it'll already bring the benefit of not annoying developers or contributors while at the same time still keeping the test somewhat useful.