added missing default value for wxEventLoopManual::Exit() parameter

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@36851 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/evtloop.h

@@ -83,7 +83,7 @@ public:
 
     // sets the "should exit" flag and wakes up the loop so that it terminates
     // soon
-    virtual void Exit(int rc);
+    virtual void Exit(int rc = 0);
 
 protected:
     // implement this to wake up the loop: usually done by posting a dummy event