[!!!][TASK] Remove option SYS/maxFileNameLength

The option $TYPO3_CONF_VARS[SYS][maxFileNameLength]
is not in use anymore and is removed.

Resolves: #72604
Releases: master
Change-Id: Ie9fa64e38bea8d5775aff5c897d36339a10c9ec8
Reviewed-on: https://review.typo3.org/45710


Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>
Reviewed-by: Oliver Klee <typo3-coding@oliverklee.de>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>