GHOST: fix WITH_GHOST_DEBUG option

Changing the order of include changes broke GHOST_DEBUG,
however it was using defines in a fragile way.

Fix by removing 'GHOST_DEBUG' and use 'WITH_GHOST_DEBUG' which
was already defined by CMake.

intern/ghost/intern/GHOST_System.cpp

@@ -309,12 +309,12 @@ GHOST_TSuccess GHOST_System::init()
   m_windowManager = new GHOST_WindowManager();
   m_eventManager = new GHOST_EventManager();
 
-#ifdef GHOST_DEBUG
+#ifdef WITH_GHOST_DEBUG
   if (m_eventManager) {
     m_eventPrinter = new GHOST_EventPrinter();
     m_eventManager->addConsumer(m_eventPrinter);
   }
-#endif  // GHOST_DEBUG
+#endif  // WITH_GHOST_DEBUG
 
   if (m_timerManager && m_windowManager && m_eventManager) {
     return GHOST_kSuccess;