Make SIGUSR1 available on BSD as well

[velnias75]

Currently on Linux NetMauMau reacts on the SIGUSR1 signal by dumping some information on the emitters terminal.

I.e. killall -USR1 nmm-server will dump

== Options ==
AI-delay: 1 sec
A/K/Q rounds: false
Decks: 1
Direction change: false
Initial card count: 5
Players: 1
Ultimate: false
== Network ==
Host: localhost
Port: 8899
Total received 0.00 kb; total sent 0.18 kb
Server start: Wed Feb 25 05:50:51 2015
Served games since server start: 0
Total served games on this server: 6

This is not working on BSD. I'll get no matching device.

A starting point to fix can be found here: 891150b

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