package/nodejs: don't build cctest target

package/nodejs: don't build cctest target

cctest is a test package that is built by default.  We don't use of it
and recently it has been failing to build in the host-nodejs builds
so disable it.

Fixes:
http://autobuild.buildroot.net/results/1d7642073d169de941e74dc3a0efba6e992e2de7
http://autobuild.buildroot.net/results/8801109c1976e1c7a08dc4036c6a38efdbb8cd7e
http://autobuild.buildroot.net/results/6d52bc9fef4c9f12f0091e93c020ab2cd4c4c5a1
http://autobuild.buildroot.net/results/a8b8a781bdea668b657311c68b6f0ca0f74169c7

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