TYPO3 Core

As minimum requirements of TYPO3 7 LTS is PHP 5.5 we can remove support for older opcode caches in OpcodeCacheUtility.

Namely:

• Alternative PHP Cache aka APC
  • The user data cache lives as apcu extension for PHP 5.5+ releases.
• eAccelerator
  • Not upgraded to PHP 5.5 compatibility and I think that won't happen.
• ZendOptimizerPlus
  • Known as OPcache for PHP 5.5+ releases.
• XCache before v3.1
  • In 3.0 there was an API change and 3.1 added compatibility with PHP 5.5 (v3.2 for PHP 5.6) http://xcache.lighttpd.net/browser/tags/3.2.0/ChangeLog so older API can be removed.