lookup: fix headers for Windows

bin/lookup.c

@@ -33,9 +33,11 @@
 #include <string.h>
 #include <assert.h>
 
-#include <sys/socket.h>
-#include <netinet/in.h>
-#include <arpa/inet.h>
+#if !defined( _WIN32 )
+# include <arpa/inet.h>
+#else
+# include <winsock2.h>
+#endif
 
 #include "bdsm.h"