[Bug 290838] net-im/tox: update to 0.2.21

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=290838

--- Comment #1 from Eric Camachat <eric@camachat.org> ---
Release notes

This release brings 2 great featues. First, the abillty to disable DNS lookups,
which has been a long requested security feature, which we plan to default to
in an upcoming version.
Second, there is an network profiler, which tallies up sent and received
network packets.

Beside these features we also have fixes like a 75% memory usage reduction for
NGCs and connecting to NGC with a password if we are already joined, which
might be necessary if a password was set or changed while you where away.
Furthermore, we now have better localhost discovery, which means that nodes on
the same system find each other.

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