[TYPO3-core] RFC: #11052: Show Warning if memcache is configured but not installed / working on the server

[Steffen Kamper]

Hi,

This is SVN patch request.

Type: Bugfix

Branches: trunk

BT reference: http://bugs.typo3.org/view.php?id=11052

If memcache is configured in localconf.php, it can fail. With missing 
php-extension you'll get an exception anyway, but if it's present and 
memcache isn't installed on the server you don't see any warning.

I added a test in t3lib_BEfunc::displayWarningMessages to show this 
warning in case of misconfiguration.

vg Steffen
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