Add support for MacOSX x86_64

git-svn-id: https://svn.apache.org/repos/asf/openoffice/trunk@1591346 13f79535-47bb-0310-9956-ffa450edef68
Add extension description

git-svn-id: https://svn.apache.org/repos/asf/openoffice/trunk@1591347 13f79535-47bb-0310-9956-ffa450edef68