Remove some duplicate extensions (reported by Jacob Rus)

Add more unregistered Microsoft types for silverlight (idiots)
   http://blogs.msdn.com/tims/archive/2008/03/18/configuring-a-web-server-to-host-silverlight-content.aspx


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@800196 13f79535-47bb-0310-9956-ffa450edef68