[TYPO3-core] RFC: #0011505: TYPO3 4.3 is slower than 4.2.8 -> re-implement native db caching

[Rupert Germann]

FYI: committed attached patch as a follow-up to trunk rev 6026

Problem:
clearing cache from adminpanel doesn't work

Solution:
remove the superfluous exclamation mark in the condition that checks if 
the caching framework is enabled.

greets
rupert