This is not quite "ca-cacert" anymore, more like "ca-sysmocom" for
the root certificates needed for us.
Only reference the COPYING.MIT as it is unlikely to change in
the next upgrade.
First ca-certificates does not create a symlink from /etc/ssl/certs
to /usr/lib/ssl/certs, second it does not run the c_rehash perl utility
making the recipe pretty useless and third it trusts way too many