Log Message:
Update www/liferea to 1.10.18.

Changes:
 * Fixes #287: media:content support broken
   (patch by Leiaz)
 * Fixes #279: Rules not visible in searchdialog
   (patch by Leiaz)
 * Fixes #83: Segfault when sorting feeds in folder
   (patch by Leiaz)
 * Fixes #302: Broken compilation with --disable-notify
   (reported by vostorga)