Revert "[TASK] Remove locale-workaround for PHP before 5.5"

This reverts commit 23b588c5.

The change is reverted as str_* methods are locale aware 
and turkish has no upper case I. Class autoloading and other 
checks depending on case changing break with turkish locale LC_CTYPE.

Change-Id: Ie4fb92411eeb2552972b92b3f2bcfdb47afcdd54
Resolves: #77551
Reverts: #63288
Releases: master,7.6
Reviewed-on: https://review.typo3.org/49512


Tested-by: Bamboo TYPO3com <info@typo3.com>
Reviewed-by: Frans Saris <franssaris@gmail.com>
Tested-by: Frans Saris <franssaris@gmail.com>