Fix responseXML problem with none async request

Two examples:
jQuery v1.9 : doesn't work as expected
http://jsfiddle.net/kein1945/UjPEk/

jQuery v1.6.4 : work correct. Object contains responseXML field
http://jsfiddle.net/kein1945/UjPEk/1/

Actualy version 2.0 doesn't work too.