package/nodejs: Update to allow selecting node.js version

[Thomas: fix minor Config.in formatting issues pointed by Yann.]

Signed-off-by: Martin Bark <martin@barkynet.com>
Reviewed-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>