In the list of subdirectories compiled, b2c2/ appears twice.

This patch removes one of the appearances.
Signed-off-by: NAndreas Ruprecht <rupran@einserver.de>
Signed-off-by: NHans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: NMauro Carvalho Chehab <m.chehab@samsung.com>