add application/x-java-jnlp-file

http://java.sun.com/developer/technicalArticles/Programming/jnlp/
(because some companies are too stupid to register a type)


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@755445 13f79535-47bb-0310-9956-ffa450edef68