Add missing includes (gcc 9.4 without pchs)

src/slic3r/GUI/BonjourDialog.cpp

@@ -5,6 +5,8 @@
 #include <set>
 #include <mutex>
 
+#include <boost/nowide/convert.hpp>
+
 #include <wx/sizer.h>
 #include <wx/button.h>
 #include <wx/listctrl.h>

src/slic3r/GUI/BonjourDialog.hpp

@@ -1,8 +1,11 @@
 #ifndef slic3r_BonjourDialog_hpp_
 #define slic3r_BonjourDialog_hpp_
 
+#include <cstddef>
 #include <memory>
 
+#include <boost/asio/ip/address.hpp>
+
 #include <wx/dialog.h>
 #include <wx/string.h>