Drop tsocks

Originally created by @intrigeri on #10959 (Redmine)

It’s been unmaintained for years in Debian, I just had to NMU it so that it is not RC-buggy anymore and can go back into Debian testing.

We’re using it for:

Git: if I get 3922b0b2 right, we could now use torsocks 2.1 with its AllowOutboundLocalhost option enabled;
ttdnsd uses tsocks’ library; maybe it’s time to realize that ttdnsd is not maintained either, and drop it or find some suitable replacement, then.

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