Warn users when installing Tor Browser based on ESR 60 on not SSE2 capable machines

We should be proactive and warn users of installing Tor Browser 52 on Windows machines not capable of SSE 2. See: https://bugzilla.mozilla.org/show_bug.cgi?id=1271759 installer adaptions Mozilla made. We can check that in our Linux start script later with the advent of ESR 59 based Tor Browsers as well (see: comment:2:ticket:19316).