[TYPO3] Remove AdditionalConfiguration.php

This file is part of the configuration for TYPO3.

Author: Josef Glatz

Typo3.gitignore

@@ -8,7 +8,6 @@
 /typo3conf/temp_CACHED*
 /typo3conf/temp_fieldInfo.php
 /typo3conf/deprecation_*.log
-/typo3conf/AdditionalConfiguration.php
 # Ignore system folders, you should have them symlinked.
 # If not comment out the following entries.
 /typo3