Core: Add clearAboutInformation function

Change-Id: Ib6dcc3b963917c096756cbff09541f4e13c8184b
Reviewed-by: Eike Ziller <eike.ziller@qt.io>

src/plugins/coreplugin/mainwindow.cpp

@@ -240,6 +240,11 @@ QStringList MainWindow::additionalAboutInformation() const
     return m_aboutInformation;
 }
 
+void MainWindow::clearAboutInformation()
+{
+    m_aboutInformation.clear();
+}
+
 void MainWindow::appendAboutInformation(const QString &line)
 {
     m_aboutInformation.append(line);