Inspired by #20636, build the 64bit version of Tor Messenger

Thanks to dcf for finding the cause of the problem.

Changes borrowed from tor-browser-build/rbm.conf

This should allow multiple users to do builds on the same machine.

 * tor-browser tag to tor-browser-45.8.0esr-6.5-2-build1

 * comm-esr45 tag to THUNDERBIRD_45_8_0_RELEASE

 * Tor Browser to 6.5.1

 * Use the tor-browser-45.7.0esr-6.5-1-build1 tag on tor-browser

 * Use the THUNDERBIRD_45_7_0_RELEASE tag on comm-esr45

 * Update tor-browser to 6.5

 * Update tor-launcher to 0.2.10.3

 * Use TB script, slightly modified for TM.

 * The copyright_year var isn't entirely satisfying.

This extension makes initial cloning of the mozilla hg repository faster
using pre-generated bundles.

https://mozilla-version-control-tools.readthedocs.org/en/latest/hgmo/bundleclone.html

Define distribution in rbm.conf rather than per project (it is still
possible to override it in each project).

Use the distribution option rather than lsb_release.

This reverts commit c0c64f88.

We are going back to using Ubuntu lucid for Linux builds.

This makes installation of i386 build dependencies possible.