Disable WebRTC
_Originally created by @sajolida on [#6468 (Redmine)](https://public-redmine-archive.tails.boum.org/code/issues/6468)_
Visiting <http://net.ipcalf.com/> with Tails 0.22\~rc1 displays the
local IP address. Pretty scary…
TBB has disable that option at compile time and we should do the same.
<https://trac.torproject.org/projects/tor/ticket/8178>
Feature Branch: bugfix/6468-disable-webrtc
### Related issues
- **Related to** tails/tails#6370
- **Related to** tails/tails#6474
issue