Fixing JIRA Issue #1545: http://issues.apache.org/jira/browse/XERCESJ-1545. Allow docs to be built on Mac OS X and other Unix environments by running in AWT headless mode. Solution thanks to Joshua Root, slightly different than his suggested patch but does the same thing.
Fixing JIRA Issue #1545: http://issues.apache.org/jira/browse/XERCESJ-1545. Allow docs to be built on Mac OS X and other Unix environments by running in AWT headless mode. Solution thanks to Joshua Root, slightly different than his suggested patch but does the same thing.

git-svn-id: 39602be06c88ea89c23a8a9fd3d1314146990de6@1212859 13f79535-47bb-0310-9956-ffa450edef68

RackerWilliams/xercesj,RackerWilliams/xercesj,RackerWilliams/xercesj