event/Loop: remove the dummy constructor argument

src/Main.cxx

@@ -411,7 +411,7 @@ int mpd_main(int argc, char *argv[])
 	}
 
 	main_thread = ThreadId::GetCurrent();
-	main_loop = new EventLoop(EventLoop::Default());
+	main_loop = new EventLoop();
 
 	instance = new Instance();
 

src/event/Loop.cxx

@@ -28,7 +28,7 @@
 
 #include <algorithm>
 
-EventLoop::EventLoop(Default)
+EventLoop::EventLoop()
 	:SocketMonitor(*this),
 	 now_ms(::MonotonicClockMS()),
 	 quit(false), busy(true),

src/event/Loop.hxx

@@ -115,9 +115,7 @@ class EventLoop final : SocketMonitor
 	ThreadId thread;
 
 public:
-	struct Default {};
-
-	EventLoop(Default dummy=Default());
+	EventLoop();
 	~EventLoop();
 
 	/**