[TASK] Added compatibility7 conflict specification in conf file

This patch adds a constrain to compatibility7 extension in order to
avoid conflicts with compatibility6

Resolves: #76099
Releases: master
Change-Id: Icaf2781b31581380df97a856129a9e28dbd77bdb
Reviewed-on: https://review.typo3.org/48052


Reviewed-by: Helmut Hummel <helmut.hummel@typo3.org>
Tested-by: Helmut Hummel <helmut.hummel@typo3.org>
Reviewed-by: Nicole Cordes <typo3@cordes.co>
Tested-by: Nicole Cordes <typo3@cordes.co>
Reviewed-by: Adrian Mot <adrian.mot@gmail.com>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>