bb.org: try using nodejs from backports

Signed-off-by: Robert Nelson <robertcnelson@gmail.com>
bb.org: disable src package when using backports

Signed-off-by: Robert Nelson <robertcnelson@gmail.com>
bb.org: xinput_calibrator: use the old checkout commit

Signed-off-by: Robert Nelson <robertcnelson@gmail.com>