too much recursion, if bind to unload

too much recursion, if bind to unload

Testcase:
$(window).bind('unload', function(){});
I think it has something to do with your $.proxy-change (http://
github.com/jquery/jquery/commit/
1d2b1a57dae0b73b3d99197f73f4edb623b5574a), but didn´t had the time to
check it.
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