Update Tor Browser Hacking page with Orfox instructions
Following #19675 (moved), we should update the build/hacking instructions for Orfox. We already have some information igt0 added, but now we can say "build TB alpha" (tor-browser-52.7.2esr-8.0-1). Unfortunately, it's not really that simple.
I wonder if we should amend the "Building Orfox" part on our Hacking document a
bit to reflect the new situation. FWIW: I needed to spent quite some time to
get the Android SDK thing to do what it was supposed to do, even after calling
./mach bootstrap. It seems to be the case that the bootstrap thing is
downloading the r24 SDK, however at the end the build-tools r23.0.3 are
missing. Trying to install them fails even with the SDK manager because I only
got offered r23.0.1 and the build system is insisting that it needs r23.0.3.
So, I ended up just sim-linking 23.0.1 -> 23.0.3 and that worked smoothly. :) I
wonder though whether there is something more straightforward we can suggest on
the doc...https://trac.torproject.org/projects/tor/ticket/19675#comment:21
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