Code review comment for lp://staging/~thomas-voss/net-cpp/fix-1423765

So, summary:

with libcurl4-gnutls-dev installed, things break. With libcurl4-openssl-dev installed, things work. (The failure of the client_http_test in that case is due to not being able to connect to 127.0.0.1:5000 instead of a missing run-time dependency.)