Add REUSEPORT option for BSD systems.

src/xpdev/sockwrap.c

@@ -69,6 +69,9 @@ static socket_option_t socket_options[] = {
 #endif
 
 	{ "REUSEADDR",			0,				SOL_SOCKET,		SO_REUSEADDR		},	
+#ifdef SO_REUSEPORT	/* BSD */
+	{ "REUSEPORT",			0,				SOL_SOCKET,		SO_REUSEPORT		},	
+#endif
 	{ "KEEPALIVE",			SOCK_STREAM,	SOL_SOCKET,		SO_KEEPALIVE		},
 	{ "DONTROUTE",			0,				SOL_SOCKET,		SO_DONTROUTE		},
 	{ "BROADCAST",			SOCK_DGRAM,		SOL_SOCKET,		SO_BROADCAST		},