[BUGFIX] GeneralUtility alias is already in use

OpenOffice to Sphinx conversion fails with a PHP fatal error
while unarchiving the zip project from docs.typo3.org.

Change-Id: Ic27cdf46b1ba27d7c521993d3f1111064f847fc7
Fixes: #54880
Reviewed-on: https://review.typo3.org/26760
Reviewed-by: Xavier Perseguers
Tested-by: Xavier Perseguers