[TASK] Early return in GeneralUtility::fixPermissions()

Do early return in GeneralUtility::fixPermissions() on windows

Resolves: #68338
Releases: master
Change-Id: Ibc084264a5db3279d197e94f8cc46e09f293bf60
Reviewed-on: http://review.typo3.org/41666


Reviewed-by: Susanne Moog <typo3@susannemoog.de>
Tested-by: Susanne Moog <typo3@susannemoog.de>
Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>