Re-disable Ctypes in TBB 7.0
We disabled JS-Ctypes as part of legacy/trac#6152 (moved). Unfortunately, it broke a key component of Torbutton (legacy/trac#9790 (moved)). Since we need to fix that and get a F17.0.9 release out ASAP, we need to re-enable ctypes for now until we can fix that and/or legacy/trac#9276 (moved).