package/nodejs: removed version 0.12.9

Remove 0.12.9 to rationalise the number of nodejs releases supported by
buildroot.  Going forward buildroot will only support the latest release
of nodejs and the 0.10.x branch for armv5 support.

Signed-off-by: Martin Bark <martin@barkynet.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>