[INTERNAL] disabled Skype feature

This feature must be fixed before it can be used again by the
end user.

Change-Id: I8478d26b777760620fa45d4a7aacf16fe34fbf65
Reviewed-on: http://saros-build.imp.fu-berlin.de/gerrit/1344
Tested-by: Jenkins CI
Reviewed-by: Stefan Rossbach <srossbach@arcor.de>