Use sources instead of distributions.

Resolves: #65570
Resolves: #68998
Resolves: #70810
Releases: master
Change-Id: I638534c808e8ddb9cc9da15f7bcd538c64434476
Reviewed-on: https://review.typo3.org/48432


Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>