switched sprunge from curl to netcat and restored as lime-debug dependency

I switched the core of sprunge upload function from curl to netcat.
The use of curl was deprecated by P4u in https://github.com/libre-mesh/lime-packages/commit/612c4fbae87bb8fd0617f3acb5bd3ce17365c8ec
Now this package doesn't depend from curl, so I added again it as dependency of lime-debug.