cosmo: disable package until upstream site is fixed

Fixes:

  http://autobuild.buildroot.org/results/1ca/1ca98e95b106a948f1c0d0153a290ae1d9adb76d/



Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Acked-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>