[Positioner] InputUDPSocket: include unistd.h
Fixes compilation on DragonFly.
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@ -48,6 +48,7 @@
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#include <iostream>
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#include <cstdio> // For perror()
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#include <unistd.h> // For close()
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#include <arpa/inet.h> // For inet_ntop()
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#include <boost/tr1/unordered_map.hpp>
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