Add wxEventLoop::ScheduleExit().

This method allows to request exiting from the given event loop even if it's
not the currently active one, unlike Exit() which would assert in this case.
With it, it becomes possible to ask the loop to terminate as soon as possible
even if a nested loop is currently running.

See #10258.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74335 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/osx/core/evtloop.h

@@ -26,7 +26,7 @@ public:
 
     // sets the "should exit" flag and wakes up the loop so that it terminates
     // soon
-    virtual void Exit(int rc = 0);
+    virtual void ScheduleExit(int rc = 0);
 
     // return true if any events are available
     virtual bool Pending() const;