Make rebuild of src-distribution work

Add one more exclude for the rat-check so that a full rebuild of the 
source distribution via the "jenkins" target actually works. 

The source-distribution additionally includes the full javadoc at this 
location.

git-svn-id: https://svn.apache.org/repos/asf/xmlbeans/trunk@1901903 13f79535-47bb-0310-9956-ffa450edef68
1 file changed