Fix wincache notice

Tracker:
http://joomlacode.org/gf/project/joomla/tracker/?action=TrackerItemEdit&tracker_item_id=33811&start=0

According to the PHP Docs for wincache_ucache_info():
http://www.php.net/manual/en/function.wincache-ucache-info.php

We have no index called "cache_entries" only a "ucache_entries"
Merge pull request #3711 from zero-24/patch-15

[#33811] Fix wincache notice