Drop unused method

Display::startLoop() isn't used anywhere and it only adds maintenance
burden, so drop it.

src/wayland/display.cpp

@@ -192,13 +192,6 @@ bool Display::start(StartMode mode)
     return d->running;
 }
 
-void Display::startLoop()
-{
-    Q_ASSERT(!d->running);
-    Q_ASSERT(d->display);
-    d->installSocketNotifier();
-}
-
 void Display::dispatchEvents(int msecTimeout)
 {
     Q_ASSERT(d->display);

src/wayland/display.h

@@ -130,15 +130,6 @@ public:
      * function returns @c true; otherwise @c false is returned.
      */
     bool start(StartMode mode = StartMode::ConnectToSocket);
-    /**
-     * Starts the event loop for the server socket.
-     * This method should only be used if start() is used before creating the
-     * QCoreApplication. In that case start() cannot fully setup the event processing
-     * and the loop needs to be started after the QCoreApplication got created.
-     * @see start
-     * @see dispatchEvents
-     **/
-    void startLoop();
     /**
      * Dispatches pending events in a blocking way. May only be used if the Display is
      * created and started before the QCoreApplication is created. Once the QCoreApplication