Small fix on Boost/Bind library (supress deprecation warning)

src/pipeline.h

@@ -4,7 +4,7 @@
 #include <sysexits.h>
 
 #include <boost/asio.hpp>
-#include <boost/bind.hpp>
+#include <boost/bind/bind.hpp>
 #include <boost/thread.hpp>
 #include <cctype>
 #include <cstdio>

src/server.h

 #ifndef SERVER_H
 #define SERVER_H
 #include <boost/asio.hpp>
-#include <boost/bind.hpp>
+#include <boost/bind/bind.hpp>
 
 #include "controls.h"
 #include "session.h"

src/session.h

@@ -2,7 +2,7 @@
 #define SESSION_H
 #include <boost/algorithm/string.hpp>
 #include <boost/asio.hpp>
-#include <boost/bind.hpp>
+#include <boost/bind/bind.hpp>
 #include <cstdlib>
 #include <iostream>
 #include <string>