version on our ftp server and the one on the author's page is the
lower (!) revision number on its own CVS ID. Otherwise they are
identical, so bump PORTEPOCH after updating the checksum.
The author notes: "All the features of xml-mode.el have now been
integrated into the latest (CVS) version of sgml-mode, so I no
longer maintain it as a separate module." Perhaps that has
something to do with the version reset? Who knows.
