system/xfburn: Noted libburn dependency
system/xfburn: Noted libburn dependency

libburn was implicitly included before by libisofs, but at
some point, libisofs stopped requiring libburn to build,
and so it was possible to install libisofs without having
the requisite libburn package installed.

Thanks to Charles for the notes on this.

Signed-off-by: Robby Workman <2f5326e16de92cfeea9ded47a50f5e7144bd5a01@slackbuilds.org>

panosmdma/SlackOnly-SlackBuilds,panosmdma/SlackOnly-SlackBuilds,panosmdma/SlackOnly-SlackBuilds,panosmdma/SlackOnly-SlackBuilds,panosmdma/SlackOnly-SlackBuilds,panosmdma/SlackOnly-SlackBuilds,panosmdma/SlackOnly-SlackBuilds