ProjectExplorer: Simplify RunControl::appendMessage

Use a signal directly now, the users know the caller.

Change-Id: Ib2ff4dbe3047eddf2a060eef060b487a4c17e78c
Reviewed-by: Christian Kandeler <christian.kandeler@qt.io>

src/plugins/projectexplorer/appoutputpane.cpp

@@ -413,8 +413,10 @@ void AppOutputPane::createNewOutputWindow(RunControl *rc)
             this, &AppOutputPane::slotRunControlFinished);
     connect(rc, &RunControl::applicationProcessHandleChanged,
             this, &AppOutputPane::enableDefaultButtons);
-    connect(rc, &RunControl::appendMessageRequested,
-            this, &AppOutputPane::appendMessage);
+    connect(rc, &RunControl::appendMessage,
+            this, [this, rc](const QString &out, Utils::OutputFormat format) {
+                appendMessage(rc, out, format);
+            });
 
     // First look if we can reuse a tab
     const Runnable thisRunnable = rc->runnable();