support for /dev/mem, /dev/kmem, /dev/port. * specialnames.xml (pathnames-posixdevices): Drop description of /dev/mem, /dev/kmem, /dev/port.
effect is to move away from DocBook SGML and DJ Delorie's doctool and toward pure DocBook XSL. (There remains just one use of doctool, and we have plans for replacing it, too.) See ChangeLog for details.