Tor Browser workaround for tor 0.2.8.1-alpha bridge private address issue
dcf wrote a Tor Browser 6.0a3 patch to workaround legacy/trac#18517 (moved), where bridges with private addresses don't work in tor 0.2.8.1-alpha.
It might only be needed for a short time, if we get a patch for legacy/trac#18517 (moved) into tor-0.2.8.2-alpha.
Please see the patch I'm about to attach.