Trick to suppress Strict standards warning thrown most JCacheController descendents

Fix for Joomlacode items:

http://joomlacode.org/gf/project/joomla/tracker/?action=TrackerItemEdit&tracker_item_id=24262

duplicated in:

http://joomlacode.org/gf/project/joomla/tracker/?action=TrackerItemEdit&tracker_id=8103&tracker_item_id=29265