Yield changes:

Yield changes:
1. Rework the loop using wxAutoNSAutoreleasePool such that each iteration
   (get/send event) is done within the context of an NSAutoreleasePool.
2. Use nil instead of [NSDate distantPast] (means the same thing)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@26700 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775