We need to backport a patch to fix compatibility with newer protobuf versions, prior to bumping protobuf. Remove CFLAGS setting -std=c++11 and enable autoreconf so that the patch is applied properly. Signed-off-by: James Hilliard <james.hilliard1@gmail.com> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>