Rationale:
- MPLAYERHQ was an alias for www[1-5].mplayerhq.hu
- www.mplayerhq.hu uses dns load balancing already
  for a while, essentially rendering the above
  alias futile
- At times, some of the www[1-9] instances do not
  participate in the balancing while others do.
  (At the time of this writing, for instance www3
   does not have a dns record but www8 does. The
   latter was not part of MASTER_SITE_MPLAYERHQ)
- The MPLAYERHQ alias was only used by two ports
  in the tree:
  multimedia/mplayer-skins
  multimedia/win32-codecs