Build Tor with seccomp

ioerror reports in #tor-dev: “Oct 25 22:47:06.000 [warn] This version of Tor was built without support for sandboxing. To build with support for sandboxing on Linux, you must have libseccomp and its necessary header files (e.g. seccomp.h).”

Since we ship a kernel which version is >= 3.5, the kernel has seccomp support. However, we should ship the following package to make it work: libseccomp2

Thoughts?

Feature Branch: feature/8174-tor-with-seccomp

Related issues

Related to #8352 (closed)
Blocks #8889 (closed)

Original created by @Dr_Whax on 8174 (Redmine)

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