Restrict hardware information to root

Development
84

Use sudo if /proc/cpuinfo isn't readable in the start-tor-browser script
SSE2

Doesn’t look like it. Still seeing this.

if test -r /proc/cpuinfo && ! grep -q '^flags\s*:.* sse2' /proc/cpuinfo; then
        complain "Tor Browser requires a CPU with SSE2 support.  Exiting."
        exit 1
fi