linux-kbuild-3.12 is not in sid anymore.
Disable the Intel Management Engine Interface driver.

It is only useful to take benefit from the integrated ME,
for out-of-band management, OS watchdog etc., which:

1. we don't care about in Tails
2. might be dangerous
3. causes bugs on various hardware (e.g. systems that reboot when asked to shut
   down)
Merge branch 'feature/disable-mei' into experimental

Conflicts:
	config/chroot_apt/preferences