Always use UTF-8 for GTK+ strings.

Strings returned and accepted by GTK+ functions always use UTF-8 independently
of the current locale and of the file name encoding we use. So use UTF-8
instead of wxConvFileName everywhere where we deal with GTK+ directly.

Closes #11743.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@63549 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/gtk/hyperlink.cpp

@@ -151,7 +151,7 @@ wxString wxHyperlinkCtrl::GetURL() const
     if ( UseNative() )
     {
         const gchar *str = gtk_link_button_get_uri(GTK_LINK_BUTTON(m_widget));
-        return wxString(str, *wxConvFileName);
+        return wxString::FromUTF8(str);
     }
 
     return wxGenericHyperlinkCtrl::GetURL();