[PD] [iemnet/tcpclient] blocks Pd when connecting to non-reachable host

[Roman Haefeli]

Hey

I only noticed that now. If you are unlucky enough to connect to a host
that is configured to simply drop (as opposed to refuse) a connection on
a non-existing or hidden port, Pd is blocked for as long as the requests
reaches a time out. This can be very long, up to a few minutes and you
can't do anything in the GUI (e.g. telling [tcpclient] to drop the
connection) while it is waiting for the connection to establish.

Pd's [netsend] behaves the same, but this one I was expecting not to be
threaded.

Roman 
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