Defer session_loaded until AFTER lo_server_new.

This seems like the right thing to do, and -might- fix OSC on Windows.

libs/surfaces/osc/osc.cc

@@ -88,7 +88,6 @@ OSC::OSC (Session& s, uint32_t port)
 {
 	_instance = this;
 
-	session_loaded (s);
 	session->Exported.connect (*this, MISSING_INVALIDATOR, boost::bind (&OSC::session_exported, this, _1, _2), this);
 }
 
@@ -227,6 +226,8 @@ OSC::start ()
 
 	register_callbacks();
 
+	session_loaded (@session);
+
 	// lo_server_thread_add_method(_sthread, NULL, NULL, OSC::_dummy_handler, this);
 
 	/* startup the event loop thread */