Python: Do not export symbols

Nothing depends on this plugin, so these exports are not needed.

Change-Id: I7a6c1c6fd1dd355c904d2dcb6d3f0522cf30adcd
Reviewed-by: hjk <hjk121@nokiamail.com>

src/plugins/pythoneditor/pythoneditorplugin.h

@@ -36,6 +36,7 @@
 #include <QScopedPointer>
 
 namespace PythonEditor {
+namespace Internal {
 
 class EditorFactory;
 class EditorWidget;
@@ -71,6 +72,7 @@ private:
     QSet<QString> m_builtins;
 };
 
+} // namespace Internal
 } // namespace PythonEditor
 
 #endif // PYTHONEDITOR_PLUGIN_H