package/fakeroot: remove

We've now entirely switched to using pseudo istead of fakeroot, so it is
time to remove the fakeroot package now.

Reported-by: Arnout Vandecappelle <arnout@mind.be>
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>