Ported almost everything to BSD. Utils::route_entries and sending link layer PDUs still don't work.

src/ipv6_address.cpp

@@ -28,8 +28,12 @@
  */
 
 #include <algorithm>
+#include "arch.h"
 #ifndef WIN32
     #include <arpa/inet.h>
+    #ifdef BSD
+        #include <sys/socket.h>
+    #endif
 #endif
 #include <limits>
 #include <iostream> // borrame