Remove a the necessity of a few weak vtables

For background, see QTBUG-45582.

Change-Id: I6c4758ce62149437c26971056b465d5dbd2b13b0
Reviewed-by: Eike Ziller <eike.ziller@qt.io>

src/plugins/vcsbase/basevcssubmiteditorfactory.cpp

@@ -74,4 +74,6 @@ VcsSubmitEditorFactory::VcsSubmitEditorFactory
     ActionManager::registerAction(&m_diffAction, DIFF_SELECTED, context);
 }
 
+VcsSubmitEditorFactory::~VcsSubmitEditorFactory() = default;
+
 } // namespace VcsBase