added code for checking if the current locale is UTF-8 at runtime

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@45609 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/gtk/app.cpp

@@ -423,6 +423,7 @@ bool wxApp::Initialize(int& argc, wxChar **argv)
 #else
     init_result = gtk_init_check( &argcGTK, &argvGTK );
 #endif
+    wxUpdateLocaleIsUtf8();
 
     if ( argcGTK != argc )
     {