build: add the missing includes only a Windows build reports (#16110)

src/slic3r/GUI/GUI_App.cpp

@@ -255,6 +255,11 @@
 #include "slic3r/GUI/wxExtensions.hpp"
 #include "slic3r/plugin/host/PluginPages.hpp"
 #include <wx/defs.h>
+#include "slic3r/GUI/Widgets/WebView.hpp"
+#include <cwchar>
+#include <wx/dataview.h>
+#include <wx/itemattr.h>
+#include <wx/version.h>
 
 //#ifdef WIN32
 //#include "BaseException.h"
@@ -283,6 +288,7 @@ typedef BOOL (WINAPI *LPFN_ISWOW64PROCESS2)(
 #endif
 #ifdef _WIN32
 #include <boost/dll/runtime_symbol_info.hpp>
+#include <direct.h>
 #endif
 
 #ifdef WIN32