[Merge] lp:~thomas-voss/net-cpp/fix-1423765 into lp:net-cpp

[Michi Henning]

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.)
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https://code.launchpad.net/~thomas-voss/net-cpp/fix-1423765/+merge/250588
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